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OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
OK Soybean Expo 2011--Weed control
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OK Soybean Expo 2011--Weed control

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Presented at 2011 OK Soybean Expo on January 19, 2011 in Stillwater.

Presented at 2011 OK Soybean Expo on January 19, 2011 in Stillwater.

Published in: Technology, Business
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  • 1. Recipe for Success:Weed Control in 2011OK Soy Expo<br />Joe Armstrong<br />Extension Weeds Specialist<br />
  • 2. Authority XL<br />FMC<br />Pre-mix of Authority & Classic<br />Use rates: 3.0 – 9.6 oz/acre<br />Fall and PRE applications<br />4.0 oz = 3.33 oz Authority DF<br />1.25 oz Classic <br />*36 month rotation restriction for canola<br />
  • 3. Warrant<br />Monsanto<br />Sold as MON 63410 in 2010<br />Use rate: 3 pints/acre<br />Apply Early POST, V2 – V3 growth stage<br />Tank-mix with POST product(s)<br />
  • 4. Verdict<br />BASF<br />Pre-mix of Sharpen & Outlook<br />Use rate: 5 – 10 floz/acre<br />Fall, burndown, and PRE applications<br />5.0 floz = 1 floz Sharpen<br />4.17 floz Outlook<br />
  • 5. Fierce<br />Valent<br />Pre-mix of Valor & pyroxysulfone<br />Use rate: 3 – 4.5 oz/acre<br />Fall, burndown, and PRE applications<br />3.0 oz = 2.0 oz Valor<br />1.5 ozpyroxysulfone<br />*Not currently labeled for use in OK<br />
  • 6. What is the #1 goal of weed control?<br />(Hint: it’s not always killing weeds)<br />
  • 7. Yield!<br />
  • 8. PRE herbicides<br /><ul><li>Improve early-season control
  • 9. Less in-season weed pressure
  • 10. Can pay for themselves with as little as 1 bu/acre increase</li></li></ul><li>When do weeds begin reducing yields?<br />Adapted from Knezevic et al. (2003) Weed Tech 17:666-673<br />
  • 11.
  • 12. PRE herbicides inno-till soybean (NW OK)<br />glyphosate + 2,4-D alone<br />7 weeks after treatment<br />All treatments included glyphosate + 2,4-D ester (32 fl oz + 1 pt)<br />
  • 13. PRE herbicides inno-till soybean (NW OK)<br />glyphosate + 2,4-D alone<br />7 weeks after treatment<br />All treatments included glyphosate + 2,4-D ester (32 fl oz + 1 pt)<br />
  • 14.
  • 15. Early POST with residual<br />
  • 16. Herbicide resistance testing update<br />
  • 17. Glyphosate-resistant marestail in Oklahoma<br />Resistant<br />Susceptible<br />Untreated<br />1x glyphosate (0.75 lbae)<br />2x glyphosate (1.5 lbae)<br />4x glyphosate (3.0 lbae)<br />Grant County, 2010<br />
  • 18. PSS-2779 “Diagnostic Service to Test for Herbicide-resistant Weeds in Oklahoma”www.weedscience.okstate.edu<br />
  • 19. 2011 Weed Control<br /><ul><li>Use a PRE herbicide
  • 20. Burndown before planting—start clean
  • 21. Tank-mix to control difficult weeds
  • 22. Spray when weeds are small</li></li></ul><li>Thanks to:<br />Cooperators:<br />Lindy Baker<br />Jay Franklin<br />Bob Ross<br />Chad Otto<br />Curtis Vap<br />
  • 23. Contact information<br />Joe Armstrong<br />OSU Dept. of Plant and Soil Sciences<br />joe.armstrong@okstate.edu<br />Twitter: @OSUWeedSci<br />www.weedscience.okstate.edu<br />

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