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TITLE    (click title to view slides)
2005 Peanut Weed Control Update

AUTHOR
Dr. Eric P. Prostko
Extension Weed Specialist
University of Georgia
Tifton, GA

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TABLE OF CONTENTS
  1. 2005 Peanut Weed Control Update
  2. Strip-Tillage Peanuts
  3. Weeds Sprayed Day of Planting vs 2 Weeks Before Planting
  4. Crabgrass Control (%) with Prowl EC vs. Prowl H20 in Dryland, Strip-Till Cotton, 2004
  5. Florida Pusley Control with Prowl in Strip Tillage - 24 DAP
  6. Can I put Prowl over-the-top of a newly emerged peanut?
  7. POST Applied Prowl Injury on Peanut
  8. Peanut Yield (DP-1) Response to Prowl Application Timings
  9. Peanut Yield (DP-1) Response to Prowl Formulations (1.00 lb ai/A)
  10. Pigweed Problems - 2004
  11. Why Palmer Amaranth?
  12. Peanut/Pigweed Herbicides
  13. Picture
  14. TSW in Georgia
  15. TSW Control in Peanut
  16. Strongarm - POST
  17. POST Strongarm Injury - 5 DAT
  18. Metolachlor Mysteries?
  19. Metolachlor Prices
  20. Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - I
  21. Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - II
  22. For More Information About Spiderwort
  23. What’s wrong with my Cadre?
  24. Cadre in 2004
  25. Cadre in 2004
  26. Cadre in 2004
  27. Valor
  28. Valor in Peanuts - The Bottom Line
  29. Reduced Rates of Valor Good or Bad idea?
  30. Florida Beggarweed Control With Valor (> 56 DAT)
  31. Cowpea Control in Peanut - 2004
  32. Spartan in Peanut
  33. Spartan Rotation Restrictions
  34. Spartan Injury
  35. Cobra in Peanut
  36. www.gaweed.com



SLIDE CONTENTS
  1. 2005 Peanut Weed Control Update Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia Tifton
  2. Strip-Tillage Peanuts 2,4-D in Feb or March? Burndown 3-4 weeks before planting Prowl Management Rate Time of application EC vs H20 Clean seedbed at planting Plan on using Poast or Select later on Could use Valor
  3. Weeds Sprayed Day of Planting Weeds Sprayed 2 Weeks Before Planting
  4. Crabgrass Control (%) with Prowl EC vs. Prowl H20 in Dryland, Strip-Till Cotton, 2004 Ratings obtained 9 WAP 1st rainfall event did not occur until 12 DAP (1”) 6 replications (10 rows x 75’) Prowl 3.3EC @ 2.4 pts/A Prowl H20 3ACS @ 2.1 pts/A a a a a a a
  5. Florida Pusley Control with Prowl in Strip Tillage – 24 DAP % control LSD0.05= 25, nontreated check = 0%
  6. Can I put Prowl over-the-top of a newly emerged peanut? Not a good idea for cotton and soybean Label specifically prohibits POST applications on these crops Overhead irrigation supplemental peanut label at planting or up to 2 days after planting and before crop emergence No data on peanut as far as I know 2004 Research
  7. POST Applied Prowl Injury on Peanut
  8. Peanut Yield (DP-1) Response to Prowl Application Timings P = 0.198 Averaged over two formulations (Prowl and Prowl H2O applied at 1.00 lb ai/A)
  9. Peanut Yield (DP-1) Response to Prowl Formulations (1.00 lb ai/A) P = 0.0541 LSD 0.10 =86 Averaged over five application timings (2.1 pt/A) (2.4 pt/A)
  10. Pigweed Problems - 2004
  11. Why Palmer Amaranth? grows faster than other pigweeds more competitive than other pigweeds prolific seed producer 1,000,000 seeds/plant 9-12 WAE 2 generations/year herbicide tolerance
  12. Peanut/Pigweed Herbicides residual herbicides DNA’s, Strongarm, Valor, Dual (or generics), Outlook Incorporation methods postemergence GMAX + Storm, Cadre, Pursuit, Blazer, Cobra, Storm Timing, timing, timing
  13. Grady County, GA (2004)
  14. TSW in Georgia Confirmed in 29 counties by GA Dept. of Ag and UGA
  15. TSW Control in Peanut plant in twin rows Gramoxone Max + Dual Magnum + Basagran or Storm – EPOST Cadre, Pursuit, Strongarm* - POST Could add more Dual here *24c label for POST applications of Strongarm in 2005 (GA only)
  16. Strongarm - POST 24c label in GA tropical spiderwort 1-2 leaf stage 0.45 ozs/A + NIS from cracking up until 30 DAP 18 month cotton/corn rotation
  17. POST Strongarm Injury - 5 DAT 0.45 ozs/A Applied 28 DAP Air Temp - 780 RH - 86% % Cloud Cover - 20
  18. Metolachlor Mysteries? 9 formulations in marketplace new metolachlors (88% s + 12% r) Dual Magnum, Dual II Magnum (Syngenta) Cinch (DuPont) old metolachlors (50% s + 50% r) Stalwart, Stalwart C (Sipcam) Me-Too-Lachlor, Me-Too-Lachlor II (Drexel) Parallel PCS, Parallel (Makhteshim-Agan)
  19. Metolachlor Prices *only labeled for use in field corn and popcorn
  20. Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - I Applied PRE at 1 pt/A. *
  21. Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - II Applied POST at 1 pt/A with glyphosate to 3” tall COMBE. *
  22. For More Information About Spiderwort UGA Extension Circular #884 Identification and Control of Tropical Spiderwort in Georgia Field Crops www.gaweed.com
  23. What’s wrong with my Cadre?
  24. Cadre in 2004 PE-09-04 August 3, 2004 60 DAT Untreated Cadre @ 1.44 ozs/A Agrioil @ 1% v/v Applied 24 DAP
  25. Cadre in 2004 PE-10-04 August 4, 2004 55 DAT Untreated Cadre @ 1.44 ozs/A Agrioil @ 1% v/v Applied 27 DAP
  26. Cadre in 2004 Untreated Gramoxone Max @ 5.5 ozs/A + Basagran @ 8 ozs/A (14 DAP) fb Cadre @ 1.44 ozs/A + 80/20 @ 0.25% v/v (29 DAP) PE-16-04 August 3, 2004
  28. Valor in Peanuts - The Bottom Line Injury will occur if heavy rainfall occurs from cracking until ~2 WAC peanut yield should not be reduced if stand is not lost except this or do not use it repeated complaints may jeopardize label! growers either love it or hate it Dedicated sprayer? hose and nozzle clean-out very important!!!!! Glyphosate was developed as an industrial cleaner!!
  29. Reduced Rates of Valor Good or Bad idea? May reduce injury potential some but Length of FL beggarweed control may be compromised Use of less than 3 ozs/A for beggarweed is below labeled rate thus Valent is not liable
  30. Florida Beggarweed Control With Valor (> 56 DAT) Source: Valent
  31. Cowpea Control in Peanut - 2004 12 treatments PRE - Spartan, Valor, Strongarm POST - Gramoxone, Blazer, Storm, Cobra, Classic All provided some control early but….. < 70% at 56 DAP Gramoxone Max (8 ozs/A) - 60% Classic (0.5 ozs/A) - 65%
  32. Spartan in Peanut Labeled in 2004 4F formulation 4.8 to 8.0 ozs/A soil-applied broadleaf weed control nutsedge cotton rotation concerns crop injury on lighter soils PPO inhibitor
  33. Spartan Rotation Restrictions
  34. Spartan Injury
  35. Cobra in Peanut Labeled in late Fall 2004 postemergence 6 leaf peanut 90 day PHI 12.5 ozs/A broadleaf weed control croton, copperleaf, ragweed, poinsettia, pigweed a hotter Blazer tank-mixes with Basagran, Cadre, Pursuit, Select, 2,4-DB
  36. www.gaweed.com