Date post: | 19-Jun-2015 |
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Technology |
Upload: | osuweedsci |
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What is the goal of weed control
in wheat?Joe Armstrong
OSU Extension Weeds Specialist
A “clean” field at harvest may not tell the whole story
The cost of dockageReduced prices
Wasted fuel
Reduced yields due to weed competition
Yield must also be a goal!
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)
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)
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
PRE & Early POST herbicides
FinesseAmber
MaverickAxiom
Prowl H2O
Untreated
Axial XL, 16.4 fl ozapplied December 2
Axiom, 8 ozapplied November 1
Timing is crucial with these products!
ALS-resistant ryegrass in OK
08-09: Confirmed in 17 counties
ALS-resistant Italian ryegrass
Treated with Axial XL
Potential for resistance to
Axial XL
Untreated 16.4 fl oz1x rate
32.8 fl oz2x rate
65.6 fl oz4x rate
CenterfieldBeyond @ 4 fl oz in fall
conventional varietyuntreated
Wheat x jointed goatgrass hybrids show the importance of
stewardship of the Clearfield trait
wheat hybrid jointed goatgrass
Contact informationJoe Armstrong
OSU Dept. of Plant and Soil Sciences
[email protected]: @OSUWeedSci
www.weedscience.okstate.edu