Slide Presentation

TITLE    (click title to view slides)

AUTHOR
Eric P. Prostko
Extension Weed Specialist
Dept. of Crop and Soil Sciences
University of Georgia
Tifton, GA

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TABLE OF CONTENTS
  1. Managing Palmer Amaranth (Peanuts, Field Corn, Soybeans)
  2. Managing Palmer Amaranth
  3. Why Palmer Amaranth?
  4. Palmer Amaranth is very competitive!!!
  5. GA Confirmed Glyphosate-Resistant Palmer Sites
  6. Commonly Used ALS Herbicides
  7. GA Confirmed ALS-Resistant Palmer Sites
  8. Use a residual herbicide!!!!
  9. Residual Herbicides Must Be Activated!!!!!!
  10. Things You Do Not Often See in Georgia
  11. PPO Resistance???
  12. Herbicide Modes of Action Info
  13. Field Trial Results
  14. Peanuts
  15. Palmer Amaranth Control in Peanuts - Macon County, GA - 2007 (38 DAT)
  16. Palmer Amaranth Control in Peanuts - Macon County, GA - 2007 (38 DAT)
  17. Palmer Amaranth Control in Peanut with PRE Herbicides
  18. 2,4-DB fb Cobra or Ultra Blazer?????
  19. Field Corn
  20. GR-Palmer Amaranth Control in Field Corn - May 31, 2007 (38 DAP)
  21. GR-Palmer Amaranth Control in Field Corn - May 31, 2007 (38 DAP)
  22. Palmer Amaranth Control in Sorghum-Sudangrass Silage
  23. Soybeans
  24. GR-Palmer Amaranth Control in Soybean - 2007 (83 DAT)
  25. GR-Palmer Amaranth Control in Soybean - 2007 (83 DAT)
  26. GR-Palmer Amaranth Control in Soybean - 2007 (77 DAT)
  27. Harmony GT XP or Harmony SG
  28. Managing Palmer Amaranth
  29. UGA Weed Science



SLIDE CONTENTS
  1. Managing Palmer Amaranth Peanuts Field 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. Commonly Used ALS Herbicides 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
  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. 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 Peanuts Macon County, GA – 2007 (38 DAT) NTC Valor SX 51WG @ 3 oz/A
  16. Palmer Amaranth Control in Peanuts Macon County, GA – 2007 (38 DAT) NTC Dual Magnum 7.62EC @ 1 pt/A
  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????? POST: June 5 (17” tall pigweed) POST2: June 9 Photos taken 24 days after POST application Untreated Cobra 2EC @ 12.5 oz/A Agrioil @ 1% v/v POST 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
  19. Field Corn
  20. GR-Palmer Amaranth Control in Field Corn May 31, 2007 (38 DAP) NTC Roundup Original Max (22 oz/A) Atrazine (2 qt/A) Prowl H20 (2.1 pt/A) EPOST (18 DAP) 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