Basis alone controlled giant foxtail completely. It also controlled velvetleaf 96% and morningglory 87% but control of yellow nutsedge and common ragweed was poor. Combining Basis plus atrazine improved control of broadleaf weeds. Likewise, Basis plus other þbroadleafþ herbicides resulted in excellent control of most weeds. There was no corn injury observed in this study. Corn yield ranged from 65 bu/A in the nontreated plots to 206 bu/A and reflected the level of weed control observed.

I. INTRODUCTION:

This study was designed to evaluate postemergence weed control in corn with Basis (premix of rimsulfuron which is related to Accent and thifensulfuron which is Pinnacle when used in soybeans) alone and in combination with several companion broadleaf herbicides.

II. HERBICIDES EVALUATED:

        Aatrex 90 WG                                    Buctril 2 EC
        Accent 75 WG                                    DPX-79406 75 WG (a premix of rimsulfuron
        Banvel 4 EC                                        plus nicosulfuron)  
        Basis 75 WG                                     Scorpion III BSP 84.3 WG
        Broadstrike Plus (Hornet)                       Stinger 3 EC
           85.6 WG

III. ABBREVIATIONS USED:

        ABNOR: above normal                             IPOHE: ivyleaf morningglory
        ABUTH: velvetleaf                               LVS: leaves
        AMBEL: common ragweed                           POLPY: Pa. smartweed
        BROSOI: broadcast soil                          S/A: seeds per acre
        CYPES: yellow nutsedge                          SETFA: giant foxtail
        DL: days later                                  XANST: common cocklebur
        ECHCG: barnyardgrass                            ZEAMX: corn
        G: grass

IV. RESULTS AND DISCUSSION:

Weed control ratings and soybean injury and yield data are presented in the attached table. There was no change in weed control following the Aug. 6 rating. Several weed species listed on the Site Description Sheet were not evaluated because of lack of uniformity in the study area.

Weed Control:

All treatments controlled giant foxtail 96 to 99% in this study, indicating the efficacy of Basis on small giant foxtail. Control of yellow nutsedge with all Basis combinations was poor (less than 65%) unless the plots also were cultivated. Velvetleaf and ivyleaf morningglory control was nearly complete with most treatments. The poor control of velvetleaf with Accent plus Buctril likely was related to the relatively tall velvetleaf (up to five inches tall) at application.

Corn Injury and Yield:

Corn injury was not observed in this study. Corn yield ranged from 65 bu/A in the nontreated plots to 206 bu/A. The yield level clearly reflected the completeness of weed control obtained with the several herbicide treatments. 

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Roundup Ready Corn Weed Control Study, 1996.

Roundup Ultra at 1.0 pt/A controlled giant foxtail and cocklebur completely and controlled velvetleaf and ivyleaf morningglory 95 and 94%, respectively. Control of yellow nutsedge was zero. Roundup Ultra did not cause any visual corn injury and there was no difference in population between plots treated and not treated with Roundup Ultra.

I. INTRODUCTION:

This study was designed to evaluate the tolerance of the Roundup Ready corn hybrid 'Natalie'/MON 832 to two rates of Roundup Ultra alone or with companion herbicides.

II. HERBICIDES EVALUATED:

        Harness Xtra 5.6 L
        MON 8435 7.5 EC (confidential product)
        Permit 75 WG
        Roundup Ultra 4 S

III. ABBREVIATIONS USED:

        ABONOR: above normal                            LVS: leaves
        ABUTH: velvetleaf                               POLPY: Pa. smartweed
        AMBEL: common ragweed                           SETFA: giant foxtail
        CHEAL: common lambsquarters                     W: weeds
        CYPES: yellow nutsedge                          XANST: common cocklebur
        GLXMA: soybeans                                 ZEAMX: corn
        IPOHE: ivyleaf morningglory

IV. RESULTS AND DISCUSSION:

Weed control and corn injury ratings and corn population is presented in the attached table. Yield was not obtained because the required isolation distance from other corn was not observed, thus the corn was destroyed at tasseling on July 31. There was no change in weed control between July 13 and 31. Several weed species listed on the Site Description Sheet were not evaluated because of lack of uniformity in the plot area.

Weed Control:

Roundup Ultra at 1.0 pt/A controlled giant foxtail 99%, velvetleaf 95%, morningglory 94%, and cocklebur 99%. Increasing the rate to 1.5 pt/A increased control of velvetleaf and morningglory to 97%. In contrast, Roundup Ultra alone or with Harness Xtra or MON 8435 controlled little or no yellow nutsedge.

 Corn Injury and Population:

Roundup Ultra alone at either rate did not cause any observable injury to this Roundup Ready corn line, MON 832. Population counts on June 24 (nine days after Roundup Ultra application) indicated no significant difference between treatments. Likewise there was no difference in population on July 13 between the several treatments. There was a decrease in population between June 24 and July 13 but this occurred in all treatments.

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Scepter/Pursuit PPI, PRE, and POST controlled giant foxtail, common ragweed, and velvetleaf almost completely. Control of yellow nutsedge and ivyleaf morningglory was more complete when Scepter/Pursuit were applied POST compared to PPI and PRE applications. Control of giant foxtail, common ragweed, and velvetleaf with Lightning was almost complete but control of nutsedge and morningglory was dependent on weed height and adjuvant. Slight corn injury was observed with all herbicides but recovery was complete. Corn yield ranged from 55 bu/A in nontreated plots to 216 bu/A.

I. INTRODUCTION:

This study was designed to evaluate an IT (imidazilinone tolerant) corn hybrid (ICI 8326 IT) tolerance to Scepter/Pursuit and weed control with this herbicide.

II, HERBICIDES EVALUATED:

        Aatrex 4 L                                      Frontier 6 EC
        Accent 75 WG                                    Prowl 3.3 EC
        AC 513,996 70 WG (Lightning)                    Resolve 75 WG (Pursuit/Banvel)
        Bicep II 5.9 L                                  Scepter/Pursuit 70 WG (1:1 ratio)
        Exceed 57 WG                                    Surpass 6.4 EC

        ABONOR: above normal                            IPOHE: ivyleaf morningglory
        ABUTH: velvetleaf                               LVS: leaves
        AMBEL: common ragweed                           PHBPU: tall morningglory
        BROSOI: broadcast soil                          SETFA: giant foxtail
        CHEAL: common lambsquarters                     V: vegetative stage (corn leaves)
        DATST: jimsonweed                               ZEAMX: corn
        GLXMA: soybeans

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 17 rating. Several weed species listed on the Site Description sheet were not evaluated because of lack of uniformity in the plot area.

Weed Control:

Scepter/Pursuit PPI, PRE, and POST controlled giant foxtail, common ragweed, and velvetleaf 96 to 99%. In contrast, control of yellow nutsedge and ivyleaf morningglory with Scepter/Pursuit POST was 96 and 98%, respectively, compared to less complete control with PPI and PRE applications. Control of all weeds with Scepter/Pursuit POST was equal to that with Surpass plus Aatrex. Further, adding Frontier to Scepter/Pursuit did not improve weed control. Lightning (AC 513,996) applied POST also controlled giant foxtail, common ragweed, and velvetleaf almost completely even when applied at 4 to 6 inch tall weeds. Control of yellow nutsedge with Lightning was only poor to fair, depending on weed height and additive used. Morningglory control with Lightning also was dependent on weed height and additive used.

Corn Injury and Yield:

Scepter/Pursuit caused moderate corn injury early in the season but recovery was rapid and complete. Similar early season injury was observed with almost all herbicides, even Surpass plus Aatrex. Corn yield in the nontreated plots was 55 bu/A and in treated plots ranged from 89 to 216 bu/A. Yield level in treated plots was closely related to the level of weed control obtained.

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IR Corn Weed Control with AC 513,996, Detail, Stature, Contour, Pursuit, and Shotgun Combinations, 1996.

All herbicides controlled giant foxtail 95 to 99% in this study. Control of yellow nutsedge was highly dependent on herbicide and in several instances on the adjuvant used with POST herbicides. Control of velvetleaf and ivyleaf morningglory was most consistent with treatments that included atrazine. Little or no corn injury was observed in this study. Corn yield ranged from 83 bu/A in the nontreated plots to 208 bu/A.

I. INTRODUCTION:

IR (imidazilinone resistant) corn has been available commercially for several years. This study was designed to evaluate several imidazilinone-based herbicides for weed control and tolerance of the IR corn to these herbicides.

II. HERBICIDES EVALUATED:

        Aatrex 4 L                                      Frontier 6 EC
        Accent 75 WG                                    Guardsman 5 L
        AC 513,996 70 WG (Lightning-Premix              Harness 7 EC
           of Pursuit + imazapyr)                       Harness Xtra 5.6 L
        Banvel 4 EC                                     Marksman 3.2 L
        Bicep II 5.9 L                                  Pursuit 70 WG
        Buctril 2 EC                                    Pursuit Plus 2.9 EC
        Canopy 75 WG                                    Scepter 70 WG
        Contour (Pursuit/atrazine) 3.38 L               Shotgun 3.25 L (atrazine + 2,4-D)
        Detail (Scepter/Frontier) 4.1 EC                Stature (Frontier/Pursuit) 6.5 EC
        Dual II 7.8 EC                                  Surpass 100 5 L

III. ABBREVIATIONS USED:

        ABONOR: above normal                            S/A: seed/acre
        ABUTH: velvetleaf                               SETFA: giant foxtail
        BROSOI: broadcast soil                          V: vegetative stage (corn leaves)
        CYPES: yellow nutsedge                          W: weeds
        GLXMA: soybeans                                 ZEAMX: corn
        IPOHE: ivyleaf morningglory

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached tables. There was no change in weed control following the July 15 rating.

Weed Control:

All herbicides controlled giant foxtail 95 to 99% in this study whether applied PRE or POST. Control of yellow nutsedge was highly dependent on the specific herbicide or herbicide combination, and in several instances on the adjuvant used with the POST herbicides. Lightning applied at 2 to 4 inch nutsedge controlled it 92% compared to only 17% when applied at 4 to 6 inch nutsedge. Detail, Stature, Contour, and Dual II plus Canopy also controlled nutsedge 90% or greater. Many treatments controlled velvetleaf and ivyleaf morningglory 95% or greater. Treatments that included atrazine were most effective in controlling morningglory.

Corn Injury and Yield:

Little or no corn injury was observed in this study. In the few instances where injury was observed, recovery was rapid and complete. Corn yield ranged from 83 bu/A in the nontreated plots to 208 bu/A. In plots treated with herbicides, yield was related to the level of weed control obtained.

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Aatrex PRE alone at 1.0 qt/A controlled giant foxtail and velvetleaf completely, thus it was not possible to evaluate the benefit of companion POST herbicides on these weeds. In contrast, the only treatments that gave a high level of control of yellow nutsedge were those including Laddok S-12. No corn injury was observed in this study. Corn yield ranged from 93 bu/A in the nontreated plots to 220 bu/A.

I. INTRODUCTION:

Poast compatible corn (resistant to Poast) became available commercially in 1995. This technology adds another postemergence herbicide for grass control in corn. This study was designed to evaluate weed control in corn with combinations of Poast Plus and companion broadleaf herbicides. Aatrex PRE was applied to all plots except the nontreated.

II. HERBICIDES EVALUATED:

        Aatrex 4 L
        Accent 75 WG
        Buctril 2 EC
        Laddok S-12 5 L
        Poast Plus

III. ABBREVIATIONS USED:

        ABONOR: above normal                            IPOHE: ivyleaf morningglory
        ABUTH: velvetleaf                               LVS: leaves
        BROFOL: broadcast foliar                        SETFA: giant foxtail
        BROSOI: broadcast soil                          V: soybean vegetative stage
        CYPES: yellow nutsedge                          W: weeds
        GLXMA: soybeans                                 ZEAMX: corn

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 22 rating. Ivyleaf morningglory control was not rated because it was not distributed uniformly in the plot area.

Weed Control:

All treatments including Aatrex PRE at 1 qt/A controlled giant foxtail and velvetleaf completely, thus it was not possible to evaluate the benefit of companion POST herbicides on these weeds. The only treatments that controlled yellow nutsedge adequately were those that included Laddok S-12 where control was 97-98%.

Corn Injury and Yield:

No corn injury was observed in this study with any herbicides, indicating the tolerance of Poast compatible corn to Poast Plus. Corn yield ranged from 93 bu/A in the nontreated plots to 220 bu/A. The highest yields were associated with treatments that controlled weeds the most completely.

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All herbicides controlled giant foxtail, velvetleaf, and ivyleaf morningglory 98 to 99% except in one instance. Treatments that included Laddok S-12 or Basagran also controlled yellow nutsedge 92 to 99%. Poast Plus caused no corn injury in this study, whereas Select caused substantial injury. Corn yield ranged from 122 bu/A in the nontreated plots to 223 bu/A. Yield in plots treated with Select was only 27 bu/A, reflecting the severe injury caused by this herbicide.

I. INTRODUCTION:

Poast compatible corn (resistant to Poast) became available commercially in 1995. This study was designed to evaluate weed control in corn with POST only applications of Poast Plus plus companion broadleaf herbicides.

II. HERBICIDES EVALUATED:

        Aatrex 4 L                                      Laddok S-12 5 L
        Accent 75 WG                                    Marksman 3.2 L
        Basagran 4 S                                    Poast Plus 1 EC
        Buctril 2 EC                                    Select 2 EC
        Clarity 5 EC                                    Surpass 6.4 EC
        Dual II 7.8 EC                                  Weedone 638 2.8 EC

III. ABBREVIATIONS USED:

        ABONOR: above normal                            GLXMA: soybeans
        ABUTH: velvetleaf                               IPOHE: ivyleaf morningglory
        BROFOL: broadcast foliar                        LVS: leaves
        BROSOI: broadcast soil                          SETFA: giant foxtail
        CYPES: yellow nutsedge                          SR: sethoxydim resistant
        DATST: jimsonweed                               V: corn vegetative stage
        DL: days later                                  W: weeds
        ECHCG: barnyardgrass                            ZEAMX: corn
        G: grass

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 31 rating. Several weed species listed in the Site Description Sheet were not rated because they were not distributed uniformly in the plot area.

Weed Control:

All herbicides controlled giant foxtail, velvetleaf, and ivyleaf morningglory 98 to 99%, except in one instance. These results indicate that total POST treatments can control grass and broadleaf weeds equal to PRE plus POST applications. Control of yellow nutsedge was 92 to 99% with treatments that included Laddok S-12 or Basagran. In contrast, treatments without either of these herbicides controlled little or no nutsedge.

Corn Injury and Yield:

Treatments that included Poast Plus caused no visual injury to corn. In contrast, the chemically related herbicide Select caused substantial corn injury (73% on July 31) and killed some plants. Corn yield ranged from 122 bu/A in the nontreated plots to 223 bu/A. In most instances, yield level was related to the level of weed control observed. Yield in plots treated with Select was only 27 bu/A, reflecting the severe injury caused by this herbicide in Poast compatible corn.

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All herbicides controlled giant foxtail and velvetleaf 94 to 99%. In contrast, only those treatments that included Aatrex/atrazine or SAN 1269H provided a high level of control of ivyleaf morningglory. Corn injury was not observed with any of the herbicides in this study. Corn yield ranged from 150 bu/A in the nontreated plots to 234 bu/A.

I. INTRODUCTION:

This study was designed to evaluate a wide range of PPI, PRE, and POST herbicides in various combinations for weed control in reduced-till corn. Most herbicides evaluated are commercially available, but several are experimental.

II. HERBICIDES EVALUATED:

        Aatrex 4 L                                      GX-413 4 L = Cy-Pro AT 4L = Griffin cyanazine/ 
        Bicep II 5.9 L                                     atrazine
        Broadstrike Plus (Hornet) 85.6 WG               GX-414 90 DF = Cy-Pro AT 90 DF = Griffin 
        Broadstrike/Dual 7.67 EC                           cyanazine/atrazine
        Buctril/atrazine 3 L                            Harness 7 EC
        Clarity 5 EC                                    Harness Xtra 5.6 L
        Cy-Pro 90 WG&4 L (Griffith cyanazine)           Marksman 3.2 L
        Dual II 7.8 EC                                  Permit 75 WG
        Exceed 57 WG                                    SAN 1296H 70 WG
        Extrazine II 90 WG                              Surpass 6.4 EC
        Frontier 6.0 6 EC                               Surpass 100 5 L
        Guardsman 5 L                                   Tough 5 EC

III. ABBREVIATIONS USED:

        ABONOR: above normal                            LVS: leaves
        ABUTH: velvetleaf                               S/A: seed per acre
        BROFOL: broadcast foliar                        SETFA: giant foxtail
        BROSOI: broadcast soil                          W: weeds
        CYPES: yellow nutsedge                          XANST: common cocklebur
        FC2X+CM: field cultivator 2 times               ZEAMX: corn
           plus cultimulcher                            
        GLXMA: soybeans
        IPOHE: ivyleaf morningglory

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 1 rating. Several weed species listed in the Site Description Sheet were not rated because they were not distributed uniformly in the plot area.

Weed Control:

All treatments controlled giant foxtail and velvetleaf 94 to 99% with essentially complete control of these weeds in most instances. Many herbicides also controlled ivyleaf morningglory completely or nearly so. However, treatments that included Exceed, Permit, or Broadstrike/Dual controlled morningglory less than 50%. Thus, the most complete control of morningglory was with treatments that included Aatrex/atrazine or SAN 1269H (Banvel plus SAN 836H).

Corn Injury and Yield:

There was no corn injury observed with any of the herbicides in this study. Corn yield ranged from 150 bu/A in the nontreated plots to 234 bu/A. In most instances, there was no significant yield difference between treatments that included herbicide application.

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All herbicides evaluated controlled giant foxtail, velvetleaf, and ivyleaf morningglory 98% or greater. Control of yellow nutsedge ranged from 88 to 99% with most herbicides controlling this weed 95% or greater. There was no corn injury observed in this study. Corn yield ranged from 178 bu/A in the nontreated plots to 242 bu/A.

I. INTRODUCTION:

This study was designed to evaluate the weed control efficacy of several commercially available herbicides.

II. HERBICIDES EVALUATED:

        Aatrex 90 WG & 4 L            Exceed 57 WG              Marksman 3.2 L
        Axiom 68 WG                   Extrazine 4 L             Microtech 4 ME
        Bicep II 5.9 L                Frontier 6.0 6 EC         Permit 75 WG
        Broadstrike Plus (Hornet)     Guardsman 5 L             Scorpion III 84.3 WG
          85.6 WG                     Harness 7 EC              Surpass 6.4 EC
        Buctril 2 EC                  Harness Xtra 5.6 L        Surpass 100 5 L
        Bullet 4 ME                   Harness Xtra 6 L
        Dual II 7.8 EC

III. ABBREVIATIONS USED:

        ABONOR: above normal                            LVS: leaves
        ABUTH: velvetleaf                               S/A: seed per acre
        BROFOL: broadcast foliar                        SETFA: giant foxtail
        BROSOI: broadcast soil                          WAP: weeks after planting
        CYPES: yellow nutsedge                          XANST: common cocklebur
        GLXMA: soybeans                                 ZEAMX: corn
        IPOHE: ivyleaf morningglory

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 9 rating. Several weed species listed in the Site Description Sheet were not rated because they were not distributed uniformly in the plot area.

Weed Control:

All herbicides completely (98 to 99%) controlled giant foxtail, velvetleaf, and ivyleaf morningglory. In that most of the herbicides evaluated have been used commercially for several years, this level of control is not unusual. Control of yellow nutsedge was 88% or greater with all herbicides, and in most instances was 95% or greater.

Corn Injury and Yield:

None of the herbicides caused any corn injury in this study. Corn yield ranged from 178 bu/A in the nontreated plots to 242 bu/A. In all but one instance, there was no significant difference in corn yield between plots that were treated with herbicides.

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CGA-77102 II (Dual II Magnum) at equal active ingredient rates was equal to or superior than Dual II in controlling giant foxtail. All herbicides controlled velvetleaf completely. In contrast, the only herbicides that controlled ivyleaf morningglory greater than 65% were Bicep II and Weedone 638. Corn injury was not observed in any of the treatments. Corn yield ranged from 143 bu/A in the nontreated plots to 238 bu/A.

I. INTRODUCTION:

Dual (metolachlor) and Dual II have been used for many years as primarily a grass herbicide in corn and soybeans. Since the formulation of Dual is an 8 EC (8 lb ai/gal), it was assumed that the entire composition was active ingredient. In fact, about 50% of the formulation was an þinactiveþ isomer. CGA-77102 II is a formulation of metolachlor that includes only the active isomer, thus the use rate of CGA-77102 II will be substantially lower than with Dual or Dual II. Presumably, the suggested use rate of CGA-77102 II will be 0.625% of the Dual II rate. This study was designed to evaluate CGA-77102 II compared to Dual II and several competitive products for weed control in corn.

II. HERBICIDES EVALUATED:

        Action (CGA-248757) 4.57 WP                     Exceed 57 WG
        Axiom 68 WG                                     Frontier 6.0 EC
        Banvel 4 EC                                     Harness 7 EC
        Bicep II 5.9 L                                  Peak 57 WG
        Buctril 2 EC                                    Prowl 3.3 EC
        CGA-77102 II (Dual II Magnum) 7.57 EC           Surpass 6.4 EC
        Dual II 7.8 EC                                  Weedone 638 2.8 EC

        ABONOR: above normal                            IPOHE: ivyleaf morningglory
        ABUTH: velvetleaf                               LVS: leaves
        BL: broadleaf                                   S/A: seed per acre
        BROFOL: broadcast foliar                        SETFA: giant foxtail
        BROSOI: broadcast soil                          V: corn vegetative stage
        CYPES: yellow nutsedge                          XANST: common cocklebur
        GLXMA: soybeans                                 ZEAMX: corn

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 15 rating. Several weed species listed in the Site Description Sheet were not rated because they were not distributed uniformly in the plot area.

Weed Control:

All but a few of the herbicide treatments completely controlled giant foxtail. CGA-77102 II at equal active ingredient rates was equal to or more effective than Dual II in controlling giant foxtail. All herbicides controlled velvetleaf completely (99%) in this study. In contrast, the only treatments that controlled ivyleaf morningglory greater than 65% were those that included atrazine (Bicep II) or Weedone 638, which controlled morningglory 98 to 99%.

Corn Injury and Yield:

None of the herbicides caused any corn injury in this study. Corn yield ranged from 143 bu/A in the nontreated plots to 238 bu/A. In all but two instances, there was no difference in corn yield between the highest yield and other plots where herbicides were used. The low yield in the Prowl plus Weedone 638 plots was related to injury caused by the Weedone 638 because it was applied when the corn was 15 inches tall, well beyond the label timing for this herbicide.

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All herbicides controlled giant foxtail 98 to 99%. Similarly, many herbicides controlled velvetleaf completely, or nearly so, with the exception of Moxynil. Treatments that included atrazine were most effective in controlling ivyleaf morningglory. Little or no corn injury was observed in this study. Corn yield ranged from 152 bu/A in the nontreated plots to 240 bu/A.

I. INTRODUCTION:

This study was designed to evaluate several commercially available and experimental herbicides for weed control in corn. Scorpion III (formerly Broadstrike Post which consists of Broadstrike plus clopyralid plys 2,4-D), Broadstrike Plus (now called Hornet, which consists of Broadstrike plus clopyralid) (brand name for clopyralid is Stinger), Moxynil (common name is bromoxynil, same active ingredient as in Buctril), and F8426 (chemically related to Authority), plus commercially available herbicides were evaluated in this study.

II. HERBICIDES EVALUATED:

        Aatrex 90 WG                                    F8426 50 WG
        Accent 75 WG                                    Frontier 6.0 6 EC
        Banvel 4 EC                                     Moxynil 2 EC
        Broadstrike Plus (Hornet) 85.6 WG               Moxynil/atrazine 3 L
        Buctril/atrazine 3 L                            Scorpion III 84.3 WG
        Dual II 7.8 EC

III. ABBREVIATIONS USED:

        ABONOR: above normal                            LVS: leaves
        ABUTH: velvetleaf                               S/A: seed per acre
        AMARE: redroot pigweed                          SETFA: giant foxtail
        BROFOL: broadcast foliar                        V: corn vegetative stage
        BROSOI: broadcast soil                          W: weeds
        CYPES: yellow nutsedge                          XANST: common cocklebur
        GLXMA: soybeans                                 ZEAMX: corn 

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 19 rating. Several weed species listed in the Site Description Sheet were not rated because they were not distributed uniformly in the plot area.

Weed Control:

All herbicides controlled giant foxtail 98 to 99% in this study. This grass control was related primarily to the use of Frontier or Dual II applied PRE or Accent applied POST. Control of velvetleaf was dependent on the broadleaf herbicide used. Scorpion III, Hornet (Broadstrike Plus), F8426 plus Aatrex, F8426 plus Banvel, F8426 alone, and Buctril/atrazine controlled velvetleaf 96 to 99%. In contrast, velvetleaf control with Moxynil alone or with Accent or with Moxynil/atrazine was only 50 to 72%. It is not known why velvetleaf with Moxynil/atrazine at the same rate as with Buctril/atrazine was significantly lower since this is the first year of research with Moxynil or Moxynil/atrazine. Only several treatments controlled ivyleaf morningglory greater than 90%. Almost all of these included atrazine.

Corn Injury and Yield:

Little or no corn injury was observed in this study. Where injury was observed, it was slight and complete recovery was rapid. Corn yield ranged from 152 bu/A in the nontreated plots to 240 bu/A. Despite a wide range of yield in plots treated with herbicides, there were few significant differences.

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Dual II controlled giant foxtail completely and controlled yellow nutsedge 88 to 90%. Resource was especially effective in controlling velvetleaf although Buctril, Basagran, and Exceed were almost equal. Only one treatment controlled ivyleaf morningglory greater than 80%. Most herbicides caused some initial corn injury but recovery was rapid and complete. Corn yield ranged from 150 bu/A to 235 bu/A.

I. INTRODUCTION:

Resource is a POST broadleaf herbicide for use on corn or soybeans that is especially effective in controlling velvetleaf, and has some efficacy on other broadleaf weeds. This study was conducted to evaluate the efficacy of Resource in combination with Buctril, Sencor, and Basagran in broadleaf weed control compared to competitive products.

II. HERBICIDES EVALUATED:

        Basagran 4 S
        Buctril 2 EC
        Dual II 7.8 EC
        Exceed 57 WG
        Resource 0.86 EC
        Sencor 75 WG

III. ABBREVIATIONS USED:

        ABONOR: above normal                            IPOHE: ivyleaf morningglory
        ABUTH: velvetleaf                               LVS: leaves
        AMARE: redroot pigweed                          S/A: seed per acre
        AMBEL: common ragweed                           SETFA: giant foxtail
        BROFOL: broadcast foliar                        V: corn vegetative stage
        BROSOI: broadcast soil                          W: weeds
        CYPES: yellow nutsedge                          XANST: common cocklebur
        GLXMA: soybeans                                 ZEAMX: corn

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 16 rating. Several weed species listed in the Site Description Sheet were not rated because they were not distributed uniformly in the plot area.

Weed Control:

Dual II was applied to all plots except the nontreated and gave complete control of giant foxtail. Dual II also controlled yellow nutsedge 88 to 90%, prior to application of any POST herbicides. Control of velvetleaf ranged from 86 to 99% with complete control observed with most treatments. Resource (plus Dual II) was especially effective in controlling velvetleaf although Buctril, Basagran and Exceed were essentially equal in controlling velvetleaf. Only one of the herbicides evaluated controlled ivyleaf morningglory greater than 80%.

Corn Injury and Yield:

Most herbicides caused minor corn injury in this study but recovery was rapid and complete. Corn yield ranged from 151 bu/A in the nontreated plots to 235 bu/A. The lower yields in plots that included Sencor may have been related to the injury observed early season. Although complete recovery appeared to occur, the injury in association with late planting and mid-season lack of rainfall may have been responsible for the reduced yield. 

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Most herbicides treatments controlled all grass and broadleaf weeds almost completely in this study. Accent alone at 75% of label rate controlled all weeds 88 to 99%, thus it was difficult to evaluate control provided by companion herbicides. Little or no corn injury was evaluated in this study. Corn yield ranged from 146 bu/A in the nontreated plots to 233 bu/A.

I. INTRODUCTION:

This study was designed to evaluate weed control in corn with reduced rates of Accent, Exceed, and Broadstrike Plus (Hornet) compared to several commercially available herbicides that have been used for þseveralþ years.

II. HERBICIDES EVALUATED:

       Accent 75 WG                                 Prowl 3.3 EC
       Banvel 4 EC                                  Scorpion III 84.3 WG
       Broadstrike Plus 85.6 WG (Hornet)            Stinger 3 EC
       Exceed 57 WG                                 Weedone 638 2.8 EC
       Extrazine II 90 WG

III. ABBREVIATIONS USED:

       ABONOR: above normal                         IPOHE: ivyleaf morningglory
       ABUTH: velvetleaf                            LVS: leaves
       AMARE: redroot pigweed                       S/A: seed per acre
       BROFOL: broadcast foliar                     SETFA: giant foxtail
       BROSOI: broadcast soil                       V: corn vegetative stage
       CHEAL: common lambsquarters                  W: weeds
       CYPES: yellow nutsedge                       XANST: common cocklebur
       GLXMA: soybeans                              ZEAMX: corn

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 12 rating. Several weed species listed in the Site Description Sheet were not rated because they were not distributed uniformly in the plot area.

Weed Control:

All herbicides except Exceed and Broadstrike Plus (Hornet) controlled giant foxtail completely. Both Exceed and Hornet are primarily broadleaf herbicides, thus it is not unusual that they controlled foxtail less than 50%. All herbicides controlled redroot pigweed and common lambsquarters completely in this study. Likewise, most herbicides controlled velvetleaf, ivyleaf morningglory, and common cocklebur almost completely (greater than 90%). Broadleaf weed control with reduced rates of Exceed and Broadstrike Plus (Hornet) were improved substantially by the companion herbicide Accent, which controlled giant foxtail, redroot pigweed, and common lambsquarters 99%, velvetleaf 88%, ivyleaf morningglory 93%, and cocklebur 95%. Because of the high level of control of grass and broadleaf weeds in this study with Accent at 75% of label rate, weed control with Exceed. Broadstrike Plus (Hornet), and Scorpion III also was excellent.

Corn Injury and Yield:

Little or no corn injury was observed in this study. Where slight injury was observed, recovery was rapid and complete. Corn yield ranged from 146 bu/A in the nontreated plots to 233 bu/A. Differences in yield between plots that were treated with herbicides were related to the completeness of weed control.

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Early season rainfall delayed planting until May 20. Giant foxtail was controlled 88% with the lowest rate of Balance; higher rates controlled foxtail greater than 95%. Balance alone at all rates provided season-long control of velvetleaf. Ivyleaf morningglory control ranged from 62% at the lowest rate of Balance alone to 82% at the highest rate. Common cocklebur control was better than ivyleaf morningglory but not complete, ranging 78 to 93%. Herbicide applications were followed by ideal rainfall conditions that provided optimum weed control. The mobilization of the herbicides by rain also likely attributed to corn injury. Higher rates of Balance caused injury to corn in the form of chlorosis, malformation, and height reduction. Corn yield ranged from 141 bu/A in the nontreated plots to 235 bu/A. Yield level was associated with level of weed control in this study.

I. INTRODUCTION:

Balance is an experimental herbicide for weed control in corn. The active ingredient is isoxaflutole. It is from the new class of isoxazole herbicides. Balance was developed as a systemic preemergence herbicide for the control of broadleaf and grass weeds. Its mode of action is the inhibition of carotenoids. In susceptible species, Balance reduces emergence or results in bleached seedlings. Balance is adsorbed both by roots and shoots with free translocation within the plant. It can be applied preplant incorporated or preemergence and controls broadleaf weeds more effectively than grasses.

II. HERBICIDES EVALUATED:

       Aatrex 90WG                                  Exceed 57WG                          
       Balance 75WG (RPA 201772,                    Frontier 6.0 6EC
         formulation EXP31130A)                     Harness 7EC 
       Bicep II 5.9L                                Microtech 4ME
       Dual II 7.8EC                                                                                  

II. ABBREVIATIONS USED:

       ABUTH - velvetleaf                           LVS - leaves
       AMBEL - common ragweed                       PANDI - fall panicum
       BRDCST - broadcast                           POLPY - Pennsylvania smartweed
       BROSOI - broadcast soil                      PRE - preemergence
       BROFOL - broadcast foliar                    RANAB - smallflower buttercup
       CYPES - yellow nutsedge                      RCB - randomized complete block
       DAT - days after treatment                   SETFA - giant foxtail
       GLXMA - soybean                              VERPG - purslane speedwell
       GPA - gallons per acre                       XANST - common cocklebur
       HORPU - little barley                        ZEAMX - corn                                      

IV. RESULTS AND DISCUSSION:

Weed control and corn injury and yield data are presented in the attached table. There was no change in weed control following the 55 DAT rating on July 11. Corn planting in this study was delayed until May 20 because of an extended period of rainfall.

Giant Foxtail Control:

Foxtail control for treatments that included commercially available herbicides was greater than 95% season-long, while Balance alone controlled giant foxtail 88% to 98% at 28 DAT. At 51 DAT, giant foxtail control was greater than 70% at the lowest rate of Balance alone. Timely rains mobilized herbicides into the weed seed germination zone and aided in weed control.

Broadleaf Weed Control:

Velvetleaf control was complete with all rates of Balance alone and with companion herbicides season-long. Ivyleaf morningglory control ranged from 62 to 87% with Balance alone at 27 DAT. Common cocklebur control ranged 82 to 97% with Balance alone at 27 DAT. Control for both ivyleaf morningglory and common cocklebur decreased only slightly by 55 DAT. Companion herbicides improved control to approximately 85% and 95% for ivyleaf morningglory and common cocklebur, respectively. Treatments that included atrazine provided complete control. Exceed following Dual II controlled ivyleaf morningglory and common cocklebur at levels similar to the highest rate of Balance alone.

Corn Injury and Yield:

Corn injury with Balance was rate related. Balance rates lower than 1.5 oz/A caused 10% or less chlorosis, malformation and height reduction. Higher rates initially caused chlorosis 18 to 37%, malformation 15 to 45%, and height reduction of 12 to 25% at 14 DAT. By July 11, 55 DAT, ratings were 10% or less with Balance at 2.0 and 2.5 oz/A. Injury from 2.0 oz/A of Balance with companion herbicides was only slightly higher. The highest incidence of chlorosis, malformation, and height reduction, 37%, 45%, and 25% respectively, occurred with Balance at 3.0 oz/A. Corn yield ranged from 141 bu/A in the nontreated plots to 235 bu/A. Plots that were injured by 2.0 oz/A of Balance with companion herbicides generally produced better yields than plots with Balance alone. Yield level was closely associated with completeness of weed control in this study.

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Axiom controlled giant foxtail completely at the two rates evaluated but did not control any velvetleaf or ivyleaf morningglory. The efficacy of Axiom was equal to that of Dual II, Frontier 6.0, and Surpass. No herbicides caused any corn injury in this study. Corn yield ranged from 132 bu/A in the nontreated plots to 215 bu/A.

I. INTRODUCTION:

Axiom is an experimental soil residual herbicide for corn weed control consisting of a 4:1 premix of BAY FOE 5043 (an oxyacetamide vs. Lasso, Dual etc. which are chloroacetamides) plus Sencor. This study was designed to evaluate weed control with Axiom alone and with companion soil residual herbicides.

II. HERBICIDES EVALUATED:

       Aatrex 90 WG                                 Dual II 7.8 EC
       Axiom 68 WG                                  Frontier 6.0 6 EC
       Bicep II 5.9 L                               Marksman 3.2 L
       Bladex 90 WG                                 Sencor 75 WG
       Broadstrike Plus 85.6 WG                     Surpass 6.4 EC
       Buctril 2 EC                                 Weedone 638 2.8 EC

III. ABBREVIATIONS USED:

       ABONOR: above normal                         GLXMA: soybeans
       ABUTH: velvetleaf                            IPOHE: ivyleaf morningglory
       BROFOL: broadcast foliar                     LVS: leaves
       BROSOI: broadcast soil                       SETFA: giant foxtail
       CHEAL: common lambsquarters                  V: corn vegetative stage
       CYPES: yellow nutsedge                       W: weeds
       FC2X+CM: field cultivate                     XANST: common cocklebur
              2 times + cultimulch                  ZEAMX: corn

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 8 rating. Several weeds species listed in the Site Description Sheet were not rated because of their distribution in the plot area was not uniform.

Weed Control:

All herbicides controlled giant foxtail completely, indicating that Axiom was equal to Dual, Frontier 6.0, and Surpass in controlling foxtail. However, these `grassþ herbicides did not control any velvetleaf or morningglory. In contrast, Axiom plus Aatrex, Bladex, or Broadstrike Plus controlled velvetleaf completely. Axiom plus Aatrex or Bladex also controlled morningglory 98 to 99%, but Axiom plus Broadstrike Plus did not control any morningglory.

 Corn Injury and Yield:

None of the herbicides caused any corn injury in this study. Corn yield ranged from 132 bu/A in the nontreated plots to 215 bu/A. The high yield in the nontreated plots was related to vigorous corn growth throughout the season which competed actively with the several weeds in this study.

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SAN 1269H completely controlled redroot pigweed, jimsonweed, velvetleaf, and ivyleaf morningglory in this study, but similar control was obtained with Banvel. SAN 1269H caused slight initial corn injury but complete recovery occurred within one week. Corn yield ranged from 102 bu/A in the nontreated plots to 198 bu/A. The yield level was influenced by completeness of weed control.

I. INTRODUCTION:

SAN 1269H is a premix of dicamba plus SAN 836H. SAN 836H is an experimental auxin transport inhibitor that inhibits the transport of naturally occurring IAA and synthetic auxin-like compounds in plants. The herbicidal effect caused by SAN 836H occurs by interfering with the auxin balance needed for plant growth and enhancing auxin against herbicides such as dicamba. Sensitive species exhibit rapid and severe hormonal effects such as epinasty. This study was designed to evaluate corn tolerance and weed control with SAN 1269H compared to competitive commercial herbicides.

II. HERBICIDES EVALUATED:

       Aatrex 90 WG                                 Permit 75 WG
       Banvel 4 EC                                  Poast Plus 1 EC
       Broadstrike Plus (Hornet) 85.6 WG            SAN 1269H 70 WG
       Buctril/atrazine 3 L                         Scorpion III 84.3 WG
       Exceed 57 WG                                 Tough 5 EC
       Marksman 3.2 L

III. ABBREVIATIONS USED:

       ABONOR: above normal                         G: grass
       ABUTH: velvetleaf                            GLXMA: soybeans
       AMARE: redroot pigweed                       IPOHE: ivyleaf morningglory
       BL: broadleaf                                LVS: leaves
       BROFOL: broadcast foliar                     S/A: seed per acre
       BROSOI: broadcast soil                       SETFA: giant foxtail
       CHEAL: common lambsquarters                  V: velvetleaf
       CYPES: yellow nutsedge                       ZEAMX: corn
       DATST: jimsonweed

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 26 rating. Several weed species listed on the Site Description Sheet were not rated because they were distributed uniformly in the plot area.

Weed Control:

Poast Plus controlled giant foxtail 96 to 99% in this study. Control of yellow nutsedge was poor except where Tough at 1.12 pt/A plus Aatrex or SAN 1269H at 0.5 lb/A were used. Tough has provided a high level of nutsedge control in past research but it is unknown if SAN 1269H will consistently control nutsedge. In that SAN 1269H is thought of primarily as a þbroadleafþ herbicide, the 93% control observed in this study may be an anomaly. SAN 1269H completely controlled redroot pigweed, jimsonweed, velvetleaf, and ivyleaf morningglory. Similar control also was obtained with Banvel, a component of SAN 1269H.

Corn Injury and Yield:

There was slight corn injury observed initially with SAN 1269H but complete recovery occurred within a week. Similar injury occurred with Banvel and most other herbicides. Corn yield ranged from 102 bu/A in the nontreated plots to 198 bu/A. In most instances, yield level was affected by the level of weed control observed.

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Resource II, a new þformulationþ of Resource, was as effective as Resource in controlling velvetleaf, 99%, but neither formulation was very effective in controlling ivyleaf morningglory. Neither formulation caused any corn injury. Corn yield ranged from 167 bu/A in the nontreated plots to 228 bu/A.

I. INTRODUCTION:

Resource is a POST herbicide that became commercially available in 1996 for broadleaf weed control in corn and soybeans. It is especially effective on velvetleaf. This study was designed to evaluate the Resource formulation available in 1996 compared to a new one titled Resource II in this study. Although both formulations are an 0.86 EC, one or more of the components in Resource II are different than in Resource.

II. HERBICIDES EVALUATED:

       Dual II 7.8 EC
       Permit 75 WG
       Resource 0.86 EC
       Resource II 0.86 EC
       Scorpion III 84.3 WG

III. ABBREVIATIONS USED:

       ABONOR: above normal                         LVS: leaves
       ABUTH: velvetleaf                            S/A: seed per acre
       BROFOL: broadcast foliar                     SETFA: giant foxtail
       BROSOI: broadcast soil                       V: corn vegetative stage
       CHEAL: common lambsquarters                  W: weeds
       DATST: jimsonweed                            XANST: common cocklebur
       GLXMA: soybeans                              ZEAMX: corn
       IPOHE: ivyleaf morningglory

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control after the July 16 rating. Several weed species listed in the Site Description Sheet were not rated because they did not occur uniformly in the plot area.

Weed Control:

At the time of POST herbicide application on June 18, there was no control of velvetleaf or morningglory from the PRE applied Dual II. Resource and Resource II as well as Permit and Scorpion III completely controlled velvetleaf. In contrast, Resource and Resource II controlled morningglory 25% or less.

Corn Injury and Yield:

None of the herbicides caused any corn injury in this study. Corn yield ranged from 168 bu/A in the nontreated plots to 228 bu/A.

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Liberty at 1.72 pt/A plus AMS controlled giant foxtail 95% and all broadleaf weeds completely, prior to a cultivation. All other herbicides also controlled all weeds completely. Liberty did not cause any visible corn injury. Corn yield ranged from 26 bu/A in the nontreated plots to 155 bu/A.

I. INTRODUCTION:

Liberty is an experimental, non-selective POST herbicide that controls many annual grass and broadleaf weeds. Regular field corn is not tolerant to it, thus AgrEvo has developed a transgenic corn called Liberty Link that is resistant to it. This study was designed to evaluate corn tolerance to Liberty and annual weed control with this herbicide in combination with Aatrex, compared to several commercial standards.

II. HERBICIDES EVALUATED:

       Aatrex 4 L
       Accent 75 WG
       Bicep II 5.9 L
       Buctril 2 EC
       Dual II 7.8 EC
       Liberty 1.67 EC

III. ABBREVIATIONS USED:

       ABONOR: above normal                         ECHCG: barnyardgrass
       ABUTH: velvetleaf                            IPOHE: ivyleaf morningglory
       AMBEL: common ragweed                        LVS: leaves
       AMS: ammonium sulfate                        SETFA: giant foxtail
       BROFOL: broadcast foliar                     S/A: seed per acre
       BROSOI: broadcast soil                       V: corn vegetative stage
       DATST: jimsonweed                            W: weeds
       DL: days later                               ZEAMX: corn

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 26 rating. Several weed species listed in the Site Description Sheet were not rated because they were not distributed uniformly in the plot area.

Weed Control:

Liberty at 1.72 pt/A + AMS was applied on June 14 followed by a cultivation on June 22. On June 21, prior to cultivation, Liberty controlled giant foxtail 95% and all broadleaf weeds completely. The cultivation controlled the few foxtail plants not controlled by Liberty and the plots remained weed- free the remainder of the season. All other treatments also controlled all weeds completely in this study.

Corn Injury and Yield:

None of the treatments that included Liberty caused any corn injury in this study. Buctril caused slight initial corn injury but recovery was rapid. Corn yield ranged from 26 bu/A in the nontreated plots to 155 bu/A. Yield differences in plots treated with the several herbicides were not significant in most instances.

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Liberty at 1.72 pt/A, the anticipated label rate, controlled all weeds 97 to 99%. There was no benefit in increasing the rate or making multiple applications. Liberty at 1.72 and 2.44 caused little corn injury with slightly higher initial injury at 5.2 pt/A. Corn yield ranged from 23 bu/A in the nontreated plots to 134 bu/A.

I. INTRODUCTION:

Liberty is an experimental, non-selective herbicide that controls many annual grass and broadleaf weeds. It presumably will be labeled for use in 1997. This study was designed to evaluate weed control with Liberty, and tolerance of the transgenic Liberty Link corn to Liberty. Liberty Link corn also is supposed to be available for commercial use in 1997.

II. HERBICIDES EVALUATED:

       Accent 75 WG
       Buctril 2 EC
       Bullet 4 ME
       Liberty 1.67 EC

III. ABBREVIATIONS USED:

       ABONOR: above normal                         ECHCG: barnyardgrass
       ABUTH: velvetleaf                            IPOHE: ivyleaf morningglory
       AMBEL: common ragweed                        LVS: leaves
       BROFOL: broadcast foliar                     S/A: seed per acre
       BROSOI: broadcast soil                       SETFA: giant foxtail
       CHEAL: common lambsquarters                  V: corn vegetative stage
       CYPES: yellow nutsedge                       W: weeds
       DATST: jimsonweed                            ZEAMX: corn
       DL: days later

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the Aug. 9 rating. Several weed species listed in the Site Description Sheet were not rated because they were not distributed uniformly in the plot area.

Weed Control:

Liberty at 1.72 pt/A (the anticipated label rate) controlled giant foxtail, common ragweed, jimsonweed, and ivyleaf morningglory completely (99%). Using higher rates or multiple applications did not benefit weed control.

Corn Injury and Yield:

All plots were planted to Liberty Link corn (Liberty Link Reg in the treatment name in the table) except one (trt. No. 10) which was planted to an isoline that presumably was identical to Liberty Link corn except that it was not resistant to Liberty.

Liberty at 1.72 or 2.44 pt/A caused little or no corn injury. Increasing the Liberty rate to 5.2 pt (triple anticipated label rate) initially caused 13% injury but this decreased with time to only 5%. The injury consisted of height reduction.

Corn yield ranged from 23 bu/A in the no herbicide, no cultivation, no handweeding check plots to 134 bu/A. There was no significant difference in yield between any of the treatments that received one or more herbicides.

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Liberty caused little or no corn injury in this study, even at triple the anticipated label rate. There was no difference between treatments regarding corn height or population, regardless of the Liberty rate or number of applications. Corn yield ranged from 168 bu/A in the nontreated plots to 198 bu/A. There was no significant yield difference between plots treated with Liberty, even at triple the anticipated label rate, compared to plots treated with Bullet or kept weed-free with cultivation and handweeding.

I. INTRODUCTION:

Liberty is an experimental, non-selective herbicide that controls a wide range of annual weeds. Regular corn is injured by Liberty, thus it is necessary to use Liberty Link corn, which was genetically engineered to be resistant to Liberty. This study was designed to evaluate tolerance of Liberty Link corn to several rates of Liberty in a single or multiple applications under weed-free conditions. A Liberty Link isoline (not tolerant of Liberty) also was included (Trt. No. 10) as a comparison for yield.

II. HERBICIDES EVALUATED:

       Accent 75 WG
       Buctril 2 EC
       Bullet 4 ME
       Liberty 1.67 EC

III. ABBREVIATIONS USED:

       ABONOR: above normal
       BROFOL: broadcast foliar
       BROSOI: broadcast soil
       DL: days later
       FC2X+CM: field cultivate 2 times + cultimulch
       S/A: seed per acre
       W: weeds
       ZEAMX: corn

IV. WEED CONTROL:

Since all plots except the nontreated (Trt. No. 1) were cultivated (on June 22 and 28) plus handweeded as needed in addition to the herbicides, weed control ratings were not taken since the plots were kept weed-free.

Corn Injury, Height, Population, and Yield:

Liberty caused little or no corn injury in this study even at 5.2 pts/A, triple the anticipated label rate. Corn height also was not affected by Liberty, compared to the no herbicide plus cultivate plus handweed plots or any other treatment. Likewise, plant population was not significantly different between the several treatments. Corn Yield ranged from 168 bu/A in the nontreated (no herbicide, no cultivate, no handweed) plots to 198 bu/A. The high yield in the nontreated plots related to a low weed population in this plot area, which was selected specifically for that reason. There were no significant differences in yield between any treatments that were kept weed-free all season. These results indicate that Liberty, even at 5.17 pt/A (triple anticipated label rate) did not cause any corn yield reduction. Likewise, multiple applications of Liberty did not cause any corn yield reduction. Further, the yield of the Liberty Link hybrid (labeled Liberty Link Reg on the tables) was equal to that of the Liberty Link isoline from which the resistant hybrid was developed.

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Tolerance of Poast compatible corn to several postemergence grass soybean herbicides was evaluated. Select caused severe injury and reduced height, population, and yield of Poast compatible corn. Fusion caused only minimal injury to Poast compatible corn and did not reduce height, plant population, or yield. Poast and Assure II caused no injury to Poast compatible corn. Corn yield ranged from 43 to 204 bu/A. Select reduced yield by 76% compared to the no herbicide handweed treatment.

I. INTRODUCTION:

Poast is a postemergence grass herbicide used in soybean. The development of Poast compatible corn also will facilitate its use in corn. However, Poast compatible corn may also be tolerant to other postemergence grass herbicides used in soybean. Therefore, control of volunteer Poast compatible corn in soybean may be complicated if this corn is also tolerant to the postemergence grass herbicides. This study was designed to evaluate the tolerance of several postemergence grass herbicides used in soybean.

II. HERBICIDES EVALUATED:

       Assure II 0.88 EC
       Bullet 4 ME
       Fusion 2.66 EC
       Poast 1.5 EC
       Select 2 EC

III. ABBREVIATIONS USED:

       COC: crop oil concentrate
       PPI: preplant incorporated
       V4: four corn leaves
       ZEAMX: corn

IV. RESULTS AND DISCUSSION:

Bullet was applied to all plots to control weeds and aid in keeping plots weed-free season long. All plots also were cultivated.

Corn Injury:

Stunt:

Select caused 82% stunting 14 days after treatment (14 DAT) and 28% stunting 42 DAT. Fusion caused only 2% stunting 14 DAT and no stunting was evident 42 DAT. Poast and Assure II caused no stunting.

Necrosis:

Select and Fusion caused 70% and 5% necrosis, respectively, 14 DAT. However, no necrosis ws evident 28 DAT with either herbicide. Poast and Assure II caused no necrosis.

Malformation:

Plant malformation consisted of rolled and split leaves. Select caused 87% plant malformation 14 DAT and plants never fully recovered. Fusion caused 42% plant malformation 14 DAT. However, plants recovered by 21 DAT. Poast and Assure II caused no plant malformation.

Plant Height:

Final plant height ranged from 94 to 106 inches. Select reduced the final height of corn. Poast, Assure II, and Fusion did not reduce final plant height.

Plant Population:

Plant population ranged from 16,500 to 28,000 plants per acre. Select reduced final plant population. Poast, Assure II, and Fusion did not reduce final plant population.

Yield:

Corn yield ranged from 43 to 204 bu/A. Select reduced yield by 76% compared to the no herbicide handweed treatment. Yield was 180 bu/A with the no herbicide handweed treatment. Yield was 181, 204, and 199 bu/A with Poast, Assure II, and Fusion treatments, respectively.

These data indicate that control of volunteer Poast compatible corn may be difficult with current postemergence grass soybean herbicides. Select may provide better control of volunteer Poast compatible corn than other postemergence grass herbicides currently used in soybean.

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The best way to look at our Treatment Lists and Data Tables is to print them using your laser printer.

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All herbicides controlled giant foxtail completely. Control of yellow nutsedge was most complete in treatments that included Frontier, Laddok S-12, Basagran, or Tough. Control of common waterhemp was 93 to 99% with all treatments that included a broadleaf herbicide. All treatments caused some corn injury but recovery was essentially complete by mid-season. Corn yield ranged from 57 bu/A in the nontreated plots to 171 bu/A.

I. INTRODUCTION:

This study was designed to evaluate annual grass and yellow nutsedge control in Poast compatible corn with Poast Plus and companion herbicides.

II. HERBICIDES EVALUATED:

       Aatrex 90 WG                                 Laddok S-12 5 L
       Accent 75 WG                                 Permit 75 WG
       Basagran 4 S                                 Poast Plus 1 EC
       Clarity 5 EC                                 Tough 5 EC
       Frontier 6 EC

III. ABBREVIATIONS USED:

       ABONOR: above normal                         POLPY: Pa. smartweed
       ABUTH: velvetleaf                            SETFA: giant foxtail
       AMATA: common waterhemp                      SR: sethoxydim resistant
       BROFOL: broadcast foliar                     V: vegetative stage
       BROSOIL: broadcast soil                      W: weeds
       CYPES: yellow nutsedge                       XANST: common cocklebur
       G: grass                                     YN: yellow nutsedge
       IPOHE: ivyleaf morningglory                  ZEAMX: corn
       LVS: leaves

IV. RESULTS AND DISCUSSION:

Weed control ratings and corn injury and yield data are presented in the attached table. There was no change in weed control following the July 11 rating. The only weeds that were present consistently in all plots were giant foxtail, yellow nutsedge, and common waterhemp. Other weeds listed in the Site Description Sheet were not present with consistency to evaluate with confidence.

Giant Foxtail Control:

All herbicides controlled giant foxtail completely in this study regardless of weed size at application or combination of companion herbicides.

Yellow Nutsedge Control:

Treatments that included Frontier, Laddok S-12, Basagran, or Tough provided the most complete control of nutsedge in this study, usually about 90%. Tough alone at 1.5 pt/A controlled nutsedge equal to that with Basagran at 1 qt/A or combinations of Tough at 1.5 pt/A plus Aatrex or Basagran. Tough at 0.75 pt/A plus Basagran at 1.0 pt/A controlled nutsedge equal to other single treatments. In this study, Permit did not control nutsedge adequately compared to excellent control with Permit in other studies in 1996 and other years.

Common Waterhemp Control:

All herbicides except Poast Plus alone controlled waterhemp 93 to 99%, with 99% control with most herbicides.

Corn Injury and Yield:

All herbicides caused some injury ranging from 3 to 22% on July 11 at 21 days after application. Some recovery of the corn occurred following the July 11 rating. Corn yield ranged from 57 bu/A in the nontreated plots to 171 bu/A. Yield differences were not significant between plots where one or more broadleaf herbicides were applied. 

The Site Description Sheet lists pertinent information such as planting and application dates, weed species present, and soil characteristics.

Treatment Lists and Data Tables will require the Adobe Acrobat and WebLink (TM) plug-ins.

The best way to look at our Treatment Lists and Data Tables is to print them using your laser printer.

If you are unable to access our Data Tables using Adobe Acrobat and your laser printer .

Permit at half the label rate controlled 96% of 6 to 8 inch yellow nutsedge. Tough at a full rate controlled 95% of the yellow nutsedge. Aatrex controlled 58% of the yellow nutsedge. Basagran controlled 88% of the yellow nutsedge. Microtech, Dual II, and Harness applied preemergence controlled 80%, 83%, and 90% of the yellow nutsedge, respectively. Accent, Microtech, and Dual II controlled 95 to 100% of the giant foxtail. Accent plus Basagran caused visible corn injury in which 30 to 85% of the plants exhibited some injury. Yield ranged from 76 to 198 bu/A.

I. INTRODUCTION:

Yellow nutsedge may become more prevalent as tillage continues to decrease as more growers adopt no-till practices. Furthermore, the herbicides Sutan+ and Eradicane that control yellow nutsedge cannot be used in no-till because they are very volatile. Other soil herbicides such as Aatrex, Microtech, Dual II, Frontier, Surpass, etc. do not consistently control yellow nutsedge. Basagran is the only postemergence herbicide that consistently controls yellow nutsedge. However, it is usually applied at rates which decrease its cost effectiveness. Permit and Tough are new postemergence herbicides for corn which may be more cost effective for yellow nutsedge control than Basagran. Therefore, this study was designed to evaluate yellow nutsedge control in corn with Permit and Tough applied at several rates.

II. HERBICIDES EVALUATED:

       Aatrex 90 DF                                 Laddok S-12 5 L
       Accent 75 DF                                 Microtech 4 ME
       Basagran 4 S                                 Permit 75 DF
       Clarity 5 EC                                 Tough 5 EC
       Dual II 7.8 EC

III. ABBREVIATIONS USED:

       COC: crop oil concentrate                    V4: four corn leaves
       CYPES: yellow nutsedge                       ZEAMX: corn
       PRE: preemergence                            3"G: three inch grass
       SETFA: giant foxtail                         6-8"YN: 6-8" yellow nutsedge

IV. RESULTS AND DISCUSSION:

Weed control and corn injury and yield data are presented in the attached tables. There was no change in weed control following the last rating noted in the attached tables. Weeds that are listed in the 'Site Description Sheet' that were not distributed uniformly throughout the study area were not rated. All comments referring to weed control are in reference to the last rating unless noted otherwise.

 Giant Foxtail Control:

The soil herbicides were applied on May 24 and the first significant rainfall (0.96 inches) occurred three days later. Accent, Microtech, Dual II, and Harness controlled 100% of the giant foxtail. There was no antagonism between Accent and the broadleaf herbicides with grass control.

Yellow Nutsedge Control:

Microtech, Dual II, and Harness applied preemergence controlled 80%, 93%, and 90% of the yellow nutsedge, respectively. Yellow nutsedge was 6 to 8 inches at the postemergence applications. Aatrex applied postemergence controlled only 58% of the yellow nutsedge. Basagran controlled 88% of the yellow nutsedge. Permit at half the label rate controlled 96% of 6 to 8 inch yellow nutsedge. Tough at a full label rate controlled 95% of the yellow nutsedge.

Therefore, growers may be able to reduce their cost for yellow nutsedge control by 25 to 50% with Tough and Permit and still obtain acceptable control.

Crop Injury and Yield:

Accent plus Basagran caused visible corn injury in which 30 to 85% of the plants exhibited some injury. Injury was characterized as a small white patch in the mid rib of the leaf. Yield ranged from 76 bu/A in the nontreated to 198 bu/A. Accent at 0.66 oz/A plus Basagran at 1.0 qt/A reduced yield by 28% compared to the no herbicide handweed treatment. Injury and yield data support the exclusion of an Accent/Basagran tank-mix in the Accent label. No other herbicide combination reduced yield compared to the no herbicide handweed treatment.

The Site Description Sheet lists pertinent information such as planting and application dates, weed species present, and soil characteristics.

Treatment Lists and Data Tables will require the Adobe Acrobat and WebLink (TM) plug-ins.

The best way to look at our Treatment Lists and Data Tables is to print them using your laser printer.

If you are unable to access our Data Tables using Adobe Acrobat and your laser printer .

Go to the Weed Control Progress Reports Homepage .

Go to the Plant and Soil Science Department Homepage .

Go to the Southern Illinois University at Carbondale Homepage .