ok crop improvement association meeting 2011--what is the goal of weed control in wheat?
DESCRIPTION
Presented at 2011 OK Crop Improvement Association meeting on February 11, 2011 in Oklahoma City.TRANSCRIPT
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What is the goal of weed control
in wheat?Joe Armstrong
OSU Extension Weeds Specialist
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A “clean” field at harvest may not tell the whole story
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The cost of dockageReduced prices
Wasted fuel
Reduced yields due to weed competition
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Yield must also be a goal!
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Yield losses from 1 weed/ft2
Italian ryegrass = 11%wild oats = 13%
jointed goatgrass = 17%cheat = 18%
rye = 22%Adapted from Fast, Medlin, and Murray (2009)
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Yield losses from3 weeds/ft2
Italian ryegrass = 17%wild oats = 22%
jointed goatgrass = 20%cheat = 19%
rye = 41%Adapted from Fast, Medlin, and Murray (2009)
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35
40
45
50
55
60
14 28 42 56 70 84 98 112 126 140 154 168
Days after planting
Whe
at y
ield
(bu/
ac)
Olympus
Maverick
Fall applications = highest yields
≥ 85% weed control
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PRE & Early POST herbicides
FinesseAmber
MaverickAxiom
Prowl H2O
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Untreated
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Axial XL, 16.4 fl ozapplied December 2
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Axiom, 8 ozapplied November 1
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Timing is crucial with these products!
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ALS-resistant ryegrass in OK
08-09: Confirmed in 17 counties
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ALS-resistant Italian ryegrass
Treated with Axial XL
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Potential for resistance to
Axial XL
Untreated 16.4 fl oz1x rate
32.8 fl oz2x rate
65.6 fl oz4x rate
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CenterfieldBeyond @ 4 fl oz in fall
conventional varietyuntreated
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Wheat x jointed goatgrass hybrids show the importance of
stewardship of the Clearfield trait
wheat hybrid jointed goatgrass
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Contact informationJoe Armstrong
OSU Dept. of Plant and Soil Sciences
[email protected]: @OSUWeedSci
www.weedscience.okstate.edu