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
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