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Weed Control in Strip-Tillage Peanuts

Weed Control in Strip-Tillage Peanuts. Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences University of Georgia. The key to weed management in strip-tillage is to start off with a clean seed-bed at planting!. Weeds of Concern. Timing of Burndown.

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Weed Control in Strip-Tillage Peanuts

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  1. Weed Control in Strip-Tillage Peanuts Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences University of Georgia

  2. The key to weed management in strip-tillage is to start off with a clean seed-bed at planting!

  3. Weeds of Concern

  4. Timing of Burndown • 2,4-D in February/March for cutleaf eveningprimrose • Smaller weeds • Lower rates • Avoid drift problem • More time to clean out spray tank • Burndown @ 3-4 weeks before planting • may still need to do something at planting • Add Gramoxone to residual herbicides

  5. Burndown Options • Primary • glyphosate • paraquat • Tank-mixes • Valor • 2,4-D (rotations) • Aim - ???? • based upon weed species

  6. Glyphosate vs. Paraquat

  7. Effect of glyphosate rate and wheat growth stage on wheat termination – 3 WAT 15 trials conducted from 1998-2000 averaged across 11 wheat varieties (From LSU Weed Science Group)

  8. A new formulation of paraquat • 2 lbs ai/gallon • “User- friendly” • alginate • alerting agent • purgative • emetic • green dye

  9. Gramoxone Max vs. Gramoxone Inteon

  10. What about Temperature? • Depends upon weed and herbicide • Warmer is better • Watch out for sudden temperature drops

  11. The influence of air temperature on weed control with glyphosate – 14 DAT Source: Hager and Spraque, University of Illinois, 2003.

  12. The influence of air temperature on weed control with paraquat – 14 DAT Source: Hager and Spraque, University of Illinois, 2003.

  13. DNA’s or Yellow Herbicides • Prowl/Pendimax vs. Sonalan • How do we apply? • Rate • Method • Time • EC or H20 • weeds up at application • irrigation or rainfall

  14. What have we learned about using yellow herbicides in strip-tillage systems???(2004-2005) • Rate • 1.5 lb ai/A > 1.00 lb ai/A • Formulation • Prowl EC = Prowl H20 • Timing • PRE > 4 WBP > 8 WBP • Method • Spray > Fertilizer • Fertilizer Rate • 500 lbs/A > 250 lbs/A

  15. Strongarm or Valor • dryland or irrigated • weed species • rotational crops • Crop injury risks • Sprayer cleanup • ALS resistance

  16. Burndown + PRE Tank-Mixes • Usually not a problem • earlier applied, less control later in season

  17. Scout Early After Planting • Do not wait too late! • 7-10 DAP • early applications of Gramoxone should control most escapes and set up later POST treatments like Cadre

  18. Grass Problems Later • Plan on treating with Poast, Select, or Arrow Texas panicum crowfootgrass goosegrass

  19. Increased Weed Control Costs • 2,4-D @ 1 pt/A ($1.50) + application ($4.00) = $5.50/A • Generic Glyphosate @ 1 qt/A ($3.75) + application ($4.00) = $8.75/A • Extra 1 pt/A of Prowl = $2.50/A • Extra 8 ozs/A of Gramoxone Inteon ($1.68) • Arrow @ 8 ozs/A ($8.75) + COC @ 1% v/v ($1.20) + application ($4.00) = $13.95/A • Total = $32.38

  20. www.gaweed.com

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