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WEED CONTROL IN PEANUTS 2000

WEED CONTROL IN PEANUTS 2000. Dr. Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences University of Georgia Tifton. Fla. Beggarweed nutsedge tropic croton sicklepod Texas panicum. bristly starbur morningglories wild poinsettia citronmelon

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WEED CONTROL IN PEANUTS 2000

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  1. WEED CONTROL IN PEANUTS 2000 Dr. Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences University of Georgia Tifton

  2. Fla. Beggarweed nutsedge tropic croton sicklepod Texas panicum bristly starbur morningglories wild poinsettia citronmelon pigweeds Top 10 Most Troublesome Weeds in Georgia Peanuts

  3. Peanut Weed ControlMethods • cultural • mechanical • chemical

  4. When do those weeds need to be controlled??

  5. Weed Competition in Peanuts - ICritical Periods (weeks)

  6. Weed Competition in Peanuts - IICritical Periods (weeks)

  7. Peanut Weed ControlHerbicide Selection Based Upon... • weed problems • rotational crops • cost/A

  8. Dual Frontier Lasso Prowl Pursuit Sonalan Vernam (?) Zorial Peanut Weed ControlSoil-Applied Herbicides

  9. Prowl and Sonalan Label Changes for 2000 • can now be applied PRE • after planting but before emergence • mustbe irrigated within 48 hours * Prowl: 0.75” * Sonalan: 0.5-1.0”

  10. Preplant Incorporated vs. Preemergence W.C. Johnson, III 1997-99

  11. Herbicide Incorporation • herbicide in upper 2” • operating depth (4”) • Roterra/power tiller • tandem disk - 2X *perpendicular, angle • field cultivator - 2X *angle only • irrigation

  12. Do you need a soilapplied herbicide???

  13. Peanut Yield With/Without PPI Herbicides (PPI) TAES, Yoakum, 1997 LSD 0.05 = 579

  14. Basagran Blazer Cadre Classic Poast Plus Pursuit Select Starfire Storm Tough 2,4-DB Peanut Weed ControlPostemergence Herbicides

  15. Why didn’t my postemergence herbicide work??

  16. Weed Control - PostemergenceKeys to Success • calibration • timing, timing, timing • additives • nozzle selection • growing conditions

  17. The influence of additives on sicklepod control with Cadre - 68 DAT A. S. Culpepper, 1999 LSD 0.05 = 5

  18. Nozzle Selection

  19. Cadre Rotational Concerns • 18 month cotton rotation • dry weather at time of application very important • injury as low as 1.8 ppb • crop recovery??

  20. Florida Beggarweed Control • Zorial - PRE • Starfire + Storm or Basagran - CRACK • Tough + 2,4-DB - EPOST (3”) • Cadre - EPOST (2”) • Classic - LPOST (10”) • new products

  21. Peanut Weed ControlStrip Tillage • knockdown * Roundup * Gramoxone * 2,4-D ?? • residuals • postemergence • rainfall/irrigation

  22. New Options For Weed Management in Peanuts • Spartan • Strongarm • Valor

  23. Spartan 75DF or 4L • FMC • introduced in 1991 • sulfentrazone • triazolinone family • PPO oxidase inhibitor • PPI or PRE • 5.3 ozs/A (DF) or 8 ozs/A (4L)

  24. Strongarm 84WDG • Dow AgroSciences • introduced in 1995 • diclosulam • sulfonanilide family • ALS/AHAS inhibitor • PPI or PRE • 0.45 oz/A

  25. Valor 50WDG • Valent • introduced in 1989 • flumioxazin • N-phenylphthalimide derivative • PPO oxidase inhibitor • PRE • 2-3 ozs/A

  26. Crop Rotation Restrictions - I(months)

  27. Crop Rotation Restrictions - II(months)

  28. Florida Beggarweed Control

  29. Yellow Nutsedge Control

  30. Tropic Croton Control

  31. Bristly Starbur Control

  32. Wild Poinsettia Control

  33. Hophornbeam Copperleaf Stand Reduction - 31 DAP Erath County, TX 1999 Includes Sonalan at 2 pts/A - PPI

  34. SummaryNew Products • crop safety concerns • new products will help control many weeds in peanuts • rotational concerns • When will they be labeled??? • How much will they cost??

  35. University of Georgia Weed Science

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