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Ok soybean expo 2011 -weed control

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Presented at 2011 OK Soybean Expo in Stillwater, OK.

Presented at 2011 OK Soybean Expo in Stillwater, OK.

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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)
    • 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