Pursuit alone controlled giant foxtail only 58%. When Prestige was added to it, control increased to as high as 93%. Little or no soybean injury was observed with the Pursuit plus Prestige combinations. Yield ranged from 5 bu/A in the nontreated plots to 38 bu/A.

I. INTRODUCTION:

Prestige is a brand name for sethoxydim that is marketed by American Cyanamid. This study was designed to evaluate tank-mix applications of Pursuit plus Prestige to aid in the control of annual grasses.

II. HERBICIDES EVALUATED:

      Assure II 0.88 E.C.
      Concert 25 WG
      Prestige 1 E.C.
      Pursuit 70 WG
      Raptor 1 E.C.
      Scepter 70 WG
      Squadron 2.33 E.C.

III. ABBREVIATIONS USED:

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

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. 14 rating. Several weed species listed in the Site Description Sheet were not rated because they were not distributed uniformity in the plot area.

Weed Control:

Pursuit controlled only 58% of giant foxtail when Prestige was added at rates of 0.75 to 1.5 pt/A to Pursuit, foxtail control increased, but not consistently. The most complete control of foxtail was with Raptor and Assure II. Control of broadleaf weeds was highly dependent on the weed species and herbicide used.

Soybean Injury and Yield:

Little or no soybean injury was observed with any of the Pursuit treatments. Soybean yield ranged from 5 bu/A in the nontreated plots to 38 bu/A. Incomplete control of several weeds likely reduced yield in this study. 

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

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Go to the Weed Control Progress Reports Homepage .

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