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OK Soybean Expo 2011--Weed control
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OK Soybean Expo 2011--Weed control

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Presented at 2011 OK Soybean Expo on January 19, 2011 in Stillwater.

Presented at 2011 OK Soybean Expo on January 19, 2011 in Stillwater.

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OK Soybean Expo 2011--Weed control OK Soybean Expo 2011--Weed control Presentation Transcript

  • Recipe for Success:Weed Control in 2011OK Soy Expo
    Joe Armstrong
    Extension Weeds Specialist
  • Authority XL
    FMC
    Pre-mix of Authority & Classic
    Use rates: 3.0 – 9.6 oz/acre
    Fall and PRE applications
    4.0 oz = 3.33 oz Authority DF
    1.25 oz Classic
    *36 month rotation restriction for canola
  • Warrant
    Monsanto
    Sold as MON 63410 in 2010
    Use rate: 3 pints/acre
    Apply Early POST, V2 – V3 growth stage
    Tank-mix with POST product(s)
  • Verdict
    BASF
    Pre-mix of Sharpen & Outlook
    Use rate: 5 – 10 floz/acre
    Fall, burndown, and PRE applications
    5.0 floz = 1 floz Sharpen
    4.17 floz Outlook
  • Fierce
    Valent
    Pre-mix of Valor & pyroxysulfone
    Use rate: 3 – 4.5 oz/acre
    Fall, burndown, and PRE applications
    3.0 oz = 2.0 oz Valor
    1.5 ozpyroxysulfone
    *Not currently labeled for use in OK
  • What is the #1 goal of weed control?
    (Hint: it’s not always killing weeds)
  • Yield!
  • PRE herbicides
    • Improve early-season control
    • Less in-season weed pressure
    • Can pay for themselves with as little as 1 bu/acre increase
  • When do weeds begin reducing yields?
    Adapted from Knezevic et al. (2003) Weed Tech 17:666-673
  • PRE herbicides inno-till soybean (NW OK)
    glyphosate + 2,4-D alone
    7 weeks after treatment
    All treatments included glyphosate + 2,4-D ester (32 fl oz + 1 pt)
  • PRE herbicides inno-till soybean (NW OK)
    glyphosate + 2,4-D alone
    7 weeks after treatment
    All treatments included glyphosate + 2,4-D ester (32 fl oz + 1 pt)
  • Early POST with residual
  • Herbicide resistance testing update
  • Glyphosate-resistant marestail in Oklahoma
    Resistant
    Susceptible
    Untreated
    1x glyphosate (0.75 lbae)
    2x glyphosate (1.5 lbae)
    4x glyphosate (3.0 lbae)
    Grant County, 2010
  • PSS-2779 “Diagnostic Service to Test for Herbicide-resistant Weeds in Oklahoma”www.weedscience.okstate.edu
  • 2011 Weed Control
    • Use a PRE herbicide
    • Burndown before planting—start clean
    • Tank-mix to control difficult weeds
    • Spray when weeds are small
  • Thanks to:
    Cooperators:
    Lindy Baker
    Jay Franklin
    Bob Ross
    Chad Otto
    Curtis Vap
  • Contact information
    Joe Armstrong
    OSU Dept. of Plant and Soil Sciences
    joe.armstrong@okstate.edu
    Twitter: @OSUWeedSci
    www.weedscience.okstate.edu