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Maximize yield and Italian ryegrass control with 2-pass herbicide programs

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Results of research conducted during 2010-11 season looking at 1- and 2-pass herbicide programs to improve winter wheat yield and Italian ryegrass control.

Results of research conducted during 2010-11 season looking at 1- and 2-pass herbicide programs to improve winter wheat yield and Italian ryegrass control.

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  • 85% or better cheat control from 2 to 9 weeks after planting. But how much yield loss occurred in that same time frame?Fall weed control = better use of moisture, fertilizer, space. More vigorous crop = better, faster canopy development = cultural weed control.
  • 85% or better cheat control from 2 to 9 weeks after planting. But how much yield loss occurred in that same time frame?Fall weed control = better use of moisture, fertilizer, space. More vigorous crop = better, faster canopy development = cultural weed control.
  • 98% control with Axial XL, 99% control with Axiom fb Axial XL
  • 98% control with Axial XL, 99% control with Axiom fb Axial XL
  • 6.6 bu increase for Axiomfb Axial XL compared to Axial XL. At $7-8/bu wheat, the added expense of a second herbicide treatment is more than offset by the increase in yield—not to mention the increase in quality and reduction of future weed problems.
  • 6.6 bu increase for Axiomfb Axial XL compared to Axial XL. At $7-8/bu wheat, the added expense of a second herbicide treatment is more than offset by the increase in yield—not to mention the increase in quality and reduction of future weed problems.
  • 6.6 bu increase for Axiomfb Axial XL compared to Axial XL. At $7-8/bu wheat, the added expense of a second herbicide treatment is more than offset by the increase in yield—not to mention the increase in quality and reduction of future weed problems.
  • Early-season weed control leaves more moisture, fertilizer, light, and space for the crop. We will be further investigating weed control timing and nitrogen uptake by the crop and weeds this upcoming season.
  • Early-season weed control leaves more moisture, fertilizer, light, and space for the crop. We will be further investigating weed control timing and nitrogen uptake by the crop and weeds this upcoming season.
  • 5.3 bu increase for Axiomfb Axial compared to Axial XL
  • 5.3 bu increase for Axiomfb Axial compared to Axial XL
  • Timing is crucial. Also need to gather more information regarding potential variety sensitivity to metribuzin component of Axiom.
  • Axiom also provides additional herbicide modes of action to further mitigate herbicide-resistance.
  • Transcript

    • 1. Maximize yield and Italian ryegrass control with 2-pass herbicide programs
      Joe ArmstrongOSU Extension Weeds Specialist
    • 2. Crop rotation is the most effective tool for improving weed control in wheat
    • 3. However, we still have many effective tools available in winter wheat
    • 4. Fall weed control = highest yields
      60
      ≥ 85% weed control
      55
      50
      Maverick
      Wheat yield (bu/ac)
      45
      Olympus
      40
      35
      14
      28
      42
      56
      70
      84
      98
      112
      126
      140
      154
      168
      Days after planting
    • 5. Fall weed control = highest yields
      60
      Despite still achieving ≥85% cheat control at 63 days after planting, yields had already decreased by nearly 5 bu/acre.
      ≥ 85% weed control
      55
      50
      Maverick
      Wheat yield (bu/ac)
      45
      Olympus
      40
      35
      14
      28
      42
      56
      70
      84
      98
      112
      126
      140
      154
      168
      Days after planting
    • 6. PRE & Early POST herbicides
      Finesse
      Amber
      Maverick
      Axiom
      Prowl H2O
    • 7. PRE & Early POST herbicides
      Preemergence and early-postemergence herbicides can be used to maximize early-season weed control
    • 8. Excellent ryegrass control with Axial XL…
      Preharvest ratings, Stillwater 2010-11
    • 9. Excellent ryegrass control with Axial XL…
      Axial XL is very effective for postemergence ryegrass control. Axiom will control early-season ryegrass, but will provide season-long control.
      Preharvest ratings, Stillwater 2010-11
    • 10. Untreated
      Photo taken May 14
    • 11. Axial XL
      Axiom fb Axial XL
      Photos taken May 14
    • 12. Both treatments resulted in excellent ryegrass control at the end of the season
      Axial XL
      Axiom fb Axial XL
      Photos taken May 14
    • 13. ..but early-season weed control is crucial
      + 6.6 bushels
      Stillwater 2010-11
    • 14. ..but early-season weed control is crucial
      + 6.6 bushels
      Even though Axiom didn’t provide season long ryegrass control, the yields were still higher since early-season competition was reduced
      Stillwater 2010-11
    • 15. ..but early-season weed control is crucial
      + 6.6 bushels
      At $7-8/bu wheat, the added expense of a second herbicide treatment is more than offset by the increase in yield—not to mention the increase in quality and reduction of future weed problems
      Stillwater 2010-11
    • 16. Untreated
      Photo taken January 17
    • 17. Axial XL, 16.4 floz
      applied December 2
      Photo taken January 17
    • 18. Axiom, 8 oz
      applied November 1
      Photo taken January 17
    • 19. Axial XL
      10 WAT
      Axiom
      6 WAT
      Photos taken January 17
    • 20. The effects of early-season competition are very evident, both in yield and crop development
      Axial XL
      6 WAT
      Axiom
      10 WAT
      Photos taken January 17
    • 21. ..but early-season weed control is crucial
      + 5.3 bushels
      Perkins 2010-11
    • 22. ..but early-season weed control is crucial
      + 5.3 bushels
      Similar results were also observed at the trial at Perkins
      Perkins 2010-11
    • 23. Timing is crucial with Axiom.It must be applied when ryegrass is in the 1-2 leaf growth stage.
    • 24. For 2011-2012 crop:
      To maximize Italian ryegrass control:
      Axial XL POST
      To maximize yield:
      Axiom early-POST
      To maximize control and yield:
      Axiom followed-by Axial XL
    • 25. Contact information
      Joe Armstrong
      OSU Dept. of Plant and Soil Sciences
      joe.armstrong@okstate.edu
      Twitter: @OSUWeedSci
      www.weedscience.okstate.edu