Your SlideShare is downloading. ×
Recipe for Success:Weed Control in 2011OK Soy Expo<br />Joe Armstrong<br />Extension Weeds Specialist<br />
Authority XL<br />FMC<br />Pre-mix of Authority & Classic<br />Use rates: 3.0 – 9.6 oz/acre<br />Fall and PRE applications...
Warrant<br />Monsanto<br />Sold as MON 63410 in 2010<br />Use rate: 3 pints/acre<br />Apply Early POST, V2 – V3 growth sta...
Verdict<br />BASF<br />Pre-mix of Sharpen & Outlook<br />Use rate: 5 – 10 floz/acre<br />Fall, burndown, and PRE applicati...
Fierce<br />Valent<br />Pre-mix of Valor & pyroxysulfone<br />Use rate: 3 – 4.5 oz/acre<br />Fall, burndown, and PRE appli...
What is the #1 goal of weed control?<br />(Hint: it’s not always killing weeds)<br />
PRE herbicides<br /><ul><li>Improve early-season control
Less in-season weed pressure
Can pay for themselves with as little as 1 bu/acre increase</li></li></ul><li>When do weeds begin reducing yields?<br />Ad...
PRE herbicides inno-till soybean (NW OK)<br />glyphosate + 2,4-D alone<br />7 weeks after treatment<br />All treatments in...
PRE herbicides inno-till soybean (NW OK)<br />glyphosate + 2,4-D alone<br />7 weeks after treatment<br />All treatments in...
Early POST with residual<br />
Herbicide resistance testing update<br />
Glyphosate-resistant marestail in Oklahoma<br />Resistant<br />Susceptible<br />Untreated<br />1x glyphosate (0.75 lbae)<b...
PSS-2779 “Diagnostic Service to Test for Herbicide-resistant Weeds in Oklahoma”www.weedscience.okstate.edu<br />
2011 Weed Control<br /><ul><li>Use a PRE herbicide
Burndown before planting—start clean
Upcoming SlideShare
Loading in...5
×

Ok soybean expo 2011 -weed control

133

Published on

Presented at 2011 OK Soybean Expo in Stillwater, OK.

Published in: Education, Technology, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
133
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
0
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Transcript of "Ok soybean expo 2011 -weed control"

  1. 1. Recipe for Success:Weed Control in 2011OK Soy Expo<br />Joe Armstrong<br />Extension Weeds Specialist<br />
  2. 2.
  3. 3. 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 />
  4. 4. 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 />
  5. 5. 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 />
  6. 6. 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 />
  7. 7. What is the #1 goal of weed control?<br />(Hint: it’s not always killing weeds)<br />
  8. 8.
  9. 9. PRE herbicides<br /><ul><li>Improve early-season control
  10. 10. Less in-season weed pressure
  11. 11. 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 />
  12. 12.
  13. 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. 14. 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 />
  15. 15.
  16. 16. Early POST with residual<br />
  17. 17. Herbicide resistance testing update<br />
  18. 18. 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 />
  19. 19. PSS-2779 “Diagnostic Service to Test for Herbicide-resistant Weeds in Oklahoma”www.weedscience.okstate.edu<br />
  20. 20.
  21. 21. 2011 Weed Control<br /><ul><li>Use a PRE herbicide
  22. 22. Burndown before planting—start clean
  23. 23. Tank-mix to control difficult weeds
  24. 24. 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 />
  25. 25. 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 />

×