SOUTHERN ILLINOIS UNIVERSITY

PLANT AND SOIL SCIENCE DEPARTMENT

AGRONOMY RESEARCH CENTER

Carbondale, Illinois

1996 PROGRESS REPORT

SEEDLING ALFALFA WEED CONTROL

George Kapusta

PLANT AND SOIL SCIENCE RESEARCH STATIONS

BELLEVILLE AND CARBONDALE

Seedling Alfalfa Weed Control Study, 1996.

SUMMARY

Select at both rates controlled giant foxtail 99% and large crabgrass 98%. This was equal to or greater than control with Poast, Pursuit, or Raptor. Butyrac controlled all broadleaf weeds completely in this study.

I. INTRODUCTION:

This study was conducted to evaluate control of grass weeds in seedling alfalfa with Select, compared to competitive products.

II. HERBICIDES EVALUATED:

       Butyrac 200 2 EC
       Poast 1.5 EC
       Pursuit 2 AS
       Raptor 1 AS
       Select 2 EC

III. ABBREVIATIONS USED:

       ABONOR: above normal                      IPOHE: ivyleaf morningglory
       AMATA: common waterhemp                   LVS: leaves
       BROSOI: broadcast soil                    MEDSA: alfalfa
       DIGSA: large crabgrass                    MOLVE: carpetweed
       G: grass                                  SETFA: giant foxtail
       GLXMA: soybeans

IV. RESULTS AND DISCUSSION:

Weed control ratings are presented in the attached table. There was no change in weed control following the July 23 rating. All comments regarding weed control refer to the July 23 rating. Several weed species included on the `Site Description Sheetū were not rated because their distribution in the plot area was not uniform.

Select controlled giant foxtail 99% and large crabgrass 98%, compared to 95 and 93% control of these grasses with Poast. Pursuit controlled giant foxtail 77% with no control of crabgrass. Raptor was more effective than Pursuit in controlling foxtail and crabgrass. Butyrac controlled all broadleaf weeds completely in this study. None of the herbicides caused any alfalfa injury. Alfalfa yield was not obtained in this study.

Site Description Sheet The Site Description Sheet lists pertinent information such as planting and application dates, weed species present, and soil characteristics. Adobe Acrobat and WebLink(TM) Treatment Lists and Data Tables will require the Adobe Acrobat and WebLink (TM) plug-ins.
Treatment Lists and Data Tables The best way to look at our Treatment Lists and Data Tables is to print them using your laser printer. phone, FAX, e-mail, or the United States Postal Service If you are unable to access our Data Tables using Adobe Acrobat and your laser printer .
You've reached the end of the Alfalfa Weed Control Study, email your comments or questions to weedherb@siu.edu.***Revised 2/06/97***
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