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Managing Palmer Amaranth Peanuts Field Corn Soybeans

Managing Palmer Amaranth Peanuts Field Corn Soybeans. Eric P. Prostko Extension Weed Specialist Dept. of Crop & Soil Sciences The University of Georgia. Managing Palmer Amaranth. Know your enemy Resistant or not?? ALS or GR Residual herbicide Activation (irrigation or incorporation)

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Managing Palmer Amaranth Peanuts Field Corn Soybeans

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  1. Managing Palmer AmaranthPeanutsField Corn Soybeans Eric P. Prostko Extension Weed Specialist Dept. of Crop & Soil Sciences The University of Georgia

  2. Managing Palmer Amaranth • Know your enemy • Resistant or not?? • ALS or GR • Residual herbicide • Activation (irrigation or incorporation) • Timely POST’s • Avoid overusing PPO’s

  3. Why Palmer Amaranth? • 38 species of Amaranthus in U.S. • 27 species found in SE • grows faster than other pigweeds (1-2” per day!!) • more competitive than other pigweeds • prolific seed producer • Up to 1,000,000 seeds/plant • 9-12 WAE • 2 generations/year • herbicide tolerance SWSS Weed ID Guide

  4. Palmer Amaranth is very competitive!!! • Yield loss caused by 1 plant/meter of row • Soybean (27%) • Peanut (28%) • Corn (32%) • Cotton (48%)

  5. GA Confirmed Glyphosate-Resistant Palmer Sites 2005 2006 Current Testing 2007

  6. Accent Ally/Cimarron Beacon Beyond Cadre Classic Envoke Exceed Express Finesse FirstRate Glean Harmony Extra Maverick Pro Osprey Peak Permit Pursuit Python Scepter Staple Strongarm Commonly Used ALS Herbicides

  7. GA Confirmed ALS-Resistant Palmer Sites

  8. Use a residual herbicide!!!! • Corn – atrazine, Dual Magnum/Generics, Callisto, Prowl • Atrazine resistance in Macon Co (2007) • Peanut – Valor, Dual Magnum/Generics, Prowl, Sonalan • Soybean – Valor, Valor XLT, Reflex, Canopy, Sencor, Dual Magnum/Generics, Boundary, Prefix, Treflan, Prowl

  9. Residual Herbicides Must Be Activated!!!!!! • Rainfall • Irrigation • Herbicide incorporation • Conventional tillage • Dryland fields • No chance of rain • will help but not a guarantee • 2X, angle • Some herbicides should not be incorporated • Valor

  10. UFO’s Bigfoot Applications to 2” tall pigweed Things You Do Not Often See in Georgia

  11. PPO Resistance??? • PPO or Protox • Protoporphyrinogen oxidase • Enzyme found in chloroplast and mitochondria • 3 species worldwide • Common waterhemp • Common ragweed • Wild poinsettia • Many common herbicides have this mode of action!! • Ultra Blazer, Cobra, Goal, Reflex, Ronstar, Resource, Aim, Valor, Storm, Spartan, ET

  12. Herbicide Modes of Action Info • New Table in 2008 Pest Control Handbook • MOA’s listed in crop sections • www.gaweed.com

  13. Field Trial Results

  14. Peanuts

  15. Palmer Amaranth Control in PeanutsMacon County, GA – 2007 (38 DAT) NTC Valor SX 51WG @ 3 oz/A

  16. Palmer Amaranth Control in PeanutsMacon County, GA – 2007 (38 DAT) Dual Magnum 7.62EC @ 1 pt/A NTC

  17. Palmer Amaranth Control in Peanut with PRE Herbicides Valor @ 3 oz/A Dual Magnum @ 1 pt/A Stalwart @ 1 pt/A Outlook @ 1 pt/A

  18. 2,4-DB fb Cobra or Ultra Blazer????? 2,4-DB 1.75SL @ 1.1 pt/A + Agrioil @ 1% v/v (POST) fb Cobra 2EC @ 12.5 oz/A Agrioil @ 1% v/v POST2 Untreated Cobra 2EC @ 12.5 oz/A Agrioil @ 1% v/v POST POST: June 5 (17” tall pigweed) POST2: June 9 Photos taken 24 days after POST application

  19. Field Corn

  20. GR-Palmer Amaranth Control in Field CornMay 31, 2007 (38 DAP) Roundup Original Max (22 oz/A) Atrazine (2 qt/A) Prowl H20 (2.1 pt/A) EPOST (18 DAP) NTC CN-07-07

  21. GR-Palmer Amaranth Control in Field Corn May 31, 2007 (38 DAP) NTC Halex GT 4.38SC @ 4 pt/A 80/20 @ 0.25% v/v AMS @ 8.5 lbs/100 gals EPOST (18 DAP) CN-07-07

  22. Palmer Amaranth Control in Sorghum-Sudangrass Silage NTC 2,4-D amine @ 1 pt/A (27 DAT) GS-01-07

  23. Soybeans

  24. GR-Palmer Amaranth Control in Soybean – 2007 (83 DAT) Untreated Boundary 6.5EC @ 1.8 pt/A SB-01-07

  25. GR-Palmer Amaranth Control in Soybean – 2007 (83 DAT) Untreated Prefix 5.2EC @ 2.03 pt/A SB-01-07

  26. GR-Palmer Amaranth Control in Soybean – 2007 (77 DAT) Untreated Valor SX 51WG @ 3 oz/A SB-02-07

  27. Harmony GT XP or Harmony SG • Harmony GT XP (75%) • GT = grass-tank mix • XP = extruded pellet • 1/12 oz/A ($1.17) • Harmony SG (50%) • SG = soluble granules • 1/8 oz/A • 1st trifoliate until 60 days before harvest • tank-mix with glyphosate • ALS inhibitor • up to 12” tall pigweed????? • Soybean injury

  28. Managing Palmer Amaranth • Know your enemy • Resistant or not?? • ALS or GR • Residual herbicide • Timely POST’s • Avoid overusing PPO’s

  29. www.gaweed.com

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