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

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

  • Maximize yield and Italian ryegrass control with 2-pass herbicide programs
    Joe ArmstrongOSU Extension Weeds Specialist
  • Crop rotation is the most effective tool for improving weed control in wheat
  • However, we still have many effective tools available in winter wheat
  • 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
  • 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
  • PRE & Early POST herbicides
    Finesse
    Amber
    Maverick
    Axiom
    Prowl H2O
  • PRE & Early POST herbicides
    Preemergence and early-postemergence herbicides can be used to maximize early-season weed control
  • Excellent ryegrass control with Axial XL…
    Preharvest ratings, Stillwater 2010-11
  • 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
  • Untreated
    Photo taken May 14
  • Axial XL
    Axiom fb Axial XL
    Photos taken May 14
  • Both treatments resulted in excellent ryegrass control at the end of the season
    Axial XL
    Axiom fb Axial XL
    Photos taken May 14
  • ..but early-season weed control is crucial
    + 6.6 bushels
    Stillwater 2010-11
  • ..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
  • ..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
  • Untreated
    Photo taken January 17
  • Axial XL, 16.4 floz
    applied December 2
    Photo taken January 17
  • Axiom, 8 oz
    applied November 1
    Photo taken January 17
  • Axial XL
    10 WAT
    Axiom
    6 WAT
    Photos taken January 17
  • 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
  • ..but early-season weed control is crucial
    + 5.3 bushels
    Perkins 2010-11
  • ..but early-season weed control is crucial
    + 5.3 bushels
    Similar results were also observed at the trial at Perkins
    Perkins 2010-11
  • Timing is crucial with Axiom.It must be applied when ryegrass is in the 1-2 leaf growth stage.
  • 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
  • Contact information
    Joe Armstrong
    OSU Dept. of Plant and Soil Sciences
    joe.armstrong@okstate.edu
    Twitter: @OSUWeedSci
    www.weedscience.okstate.edu