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Peanut Weed Control in the Southeast - An Overview

AUTHOR
Eric P. Prostko,W. Carroll Johnson III, Nathan Smith (GA)
Barry J. Brecke, Jay Ferrell (FL)
John Everest, C. Dale Monks (AL)

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TABLE OF CONTENTS
  1. Peanut Weed Control in the Southeast - An Overview
  2. 2004 U.S. Peanut Production - Acres Planted - %
  3. The Enemies - Top 10 Most Troublesome Weeds (1-5)
  4. The Enemies - Top 10 Most Troublesome Weeds (6-10)
  5. Significant Changes That Have Occurred
  6. Increases in Twin Row Production
  7. Trends in Peanut Weed Control - Strip-Tillage Production
  8. Weed Control Challenges - Strip-Tillage Peanuts
  9. Florida Pusley
  10. Herbicide Incorporation - Mechanical or Irrigation
  11. Trends in Peanut Weed Control - Sonalan or Prowl?????
  12. Trends in Peanut Weed Control - Soil-Applied Herbicides - I
  13. Trends in Peanut Weed Control - Soil-Applied Herbicides - II
  14. Trends in Peanut Weed Control - Soil-Applied Herbicides - III
  15. Trends in Peanut Weed Control - Postemergence Herbicides - I
  16. Trends in Peanut Weed Control - Postemergence Herbicides - II
  17. What herbicides do the top peanut growers use?
  18. What happened to mechanical cultivation?
  19. New or Emerging Weed Problems
  20. Tropical Spiderwort
  21. Tropical spiderwort - How bad is it?????
  22. Groundcherry
  23. Hophornbeam copperleaf
  24. Eclipta
  25. Carpetweed
  26. Purple Moonflower
  27. Pink Purslane
  28. Spurges
  29. Glyphosate Mishaps in Peanut! A growing concern!
  30. Roundup WeatherMax vs. Crop Oil
  31. Yield Losses Caused By Roundup Weather Max Applied to Virginia Peanuts @ 30 DAP.
  32. Where are we headed?
  33. UGA Extension Weed Science



SLIDE CONTENTS
  1. Peanut Weed Control in the Southeast - An Overview Eric P. Prostko, W. Carroll Johnson, III, Nathan Smith (GA) Barry J. Brecke and Jay Ferrell (FL) John Everest and C. Dale Monks (AL)
  2. 2004 U.S. Peanut Production Acres Planted - % 1,386,000 Acres Planted in US 910,000 Acres harvested in SE (66%) Source: USDA June 2004
  3. The Enemies Top 10 Most Troublesome Weeds (1-5) SWSS SWSS 1 3 4 5 2
  4. The Enemies Top 10 Most Troublesome Weeds (6-10) SWSS SWSS 6 8 9 10 10 7
  5. Significant Changes That Have Occurred twin rows strip tillage herbicide incorporation decrease in older soil applied herbicides increase in newer herbicides cultivation weed shifts
  6. Increases in Twin Row Production Earlier canopy closure increased yield and grade decrease in TSWV better weed control? GA (50-60%)
  7. Trends in Peanut Weed Control Strip-Tillage Production Source: UGA Peanut Production Surveys
  8. Weed Control Challenges Strip-Tillage Peanuts yellow herbicide application method increased problems with …. Florida pusley Texas panicum bermudagrass more work is needed in this area
  9. Florida Pusley Why??? No DNA used lack of activation tie up on residue untimely POST’s the R word? extreme measures Prowl, Sonalan, Dual Magnum, Strongarm, and Valor Gramoxone Max
  10. Herbicide Incorporation Mechanical or Irrigation or * Equally as effective * Center-pivot irrigation is $2-7/A cheaper!
  11. Trends in Peanut Weed Control Sonalan or Prowl????? Source: UGA Peanut Production Surveys
  12. Trends in Peanut Weed Control Soil-Applied Herbicides - I Source: UGA Peanut Production Surveys
  13. Trends in Peanut Weed Control Soil-Applied Herbicides - II Source: UGA Peanut Production Surveys
  14. Trends in Peanut Weed Control Soil-Applied Herbicides - III Source: UGA Peanut Production Surveys
  15. Trends in Peanut Weed Control Postemergence Herbicides - I Source: UGA Peanut Production Surveys
  16. Trends in Peanut Weed Control Postemergence Herbicides - II Source: UGA Peanut Production Surveys
  17. What herbicides do the top peanut growers use? 2003 GA Peanut Achievement Club 16 Farms average farm size 454 acres average yield 5141 lbs/A Top 5 herbicides used Sonalan = 94% Cadre = 81% Gramoxone Max = 56% 2,4-DB = 50% Valor, Basagran = 37%
  18. What happened to mechanical cultivation? has been on the decline fuel prices better herbicides twin rows strip tillage time disease management FL beggarweed germination Source: UGA Extension Agent Surveys Peanut Cultivation in GA
  19. New or Emerging Weed Problems Weed shifts resulting from …….. changes in tillage practices changes in herbicide use patterns Some we know a lot about, some we don’t
  20. Tropical Spiderwort row spacing * twins vs. singles residuals * Dual Magnum POST’s * Gramoxone Max * Cadre * Basagran * Pursuit * Strongarm
  21. Tropical spiderwort How bad is it????? Grady County, GA
  22. Groundcherry 3 common species cutleaf (annual) smooth (perennial) clammy (perennial) little information is known cutleaf control Dual/Outlook Strongarm/Valor? Ultra Blazer SWSS SWSS cutleaf
  23. Hophornbeam copperleaf western counties more on roadsides easily controlled with Strongarm, Valor, and Ultra Blazer
  24. Eclipta Does well in wet, cool conditions should not be a problem in peanuts soil-applied Strongarm, Valor, Spartan postemergence Basagran. Blazer, Storm
  25. Carpetweed Not very competitive? Soil-applied Prowl, Sonalan, Dual, Strongarm, Spartan postemergence from Grichar 2,4-DB (58%) Cadre (80%) Storm (95%) Basagran (33%) Blazer (100%) SWSS SWSS
  26. Purple Moonflower Limited data paraquat + Storm Ultra Blazer Cadre (?????) SWSS
  27. Pink Purslane Limited data soil-applied Sonalan, Prowl, Dual, Valor postemergence paraquat + Storm or Basagran Basagran, Blazer, Storm, 2,4-DB
  28. Spurges Several species hyssop, spotted, prostrate, nodding limited data Valor Ultra Blazer Storm
  29. Glyphosate Mishaps in Peanut! A growing concern!
  30. Roundup WeatherMax vs. Crop Oil
  31. Yield Losses Caused By Roundup Weather Max Applied to Virginia Peanuts @ 30 DAP. Source: Adapted from B. Robinson, NCSU (3 years of data)
  32. Where are we headed? make do with what we got only 1 herbicide in pipeline (Cobra) 17 active ingredients new uses for older products combinations reduced rates
  33. University of Georgia Extension Weed Science (gaweed.com)