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2005 Peanut Weed Control Update

2005 Peanut Weed Control Update. Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia Tifton. Strip-Tillage Peanuts. 2,4-D in Feb or March? Burndown 3-4 weeks before planting Prowl Management Rate Time of application EC vs H 2 0

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2005 Peanut Weed Control Update

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  1. 2005 Peanut WeedControl 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 a a a a a a 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

  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) (2.1 pt/A) (2.4 pt/A) P = 0.0541 LSD 0.10 =86 Averaged over five application timings

  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 Cadre @ 1.44 ozs/A Agrioil @ 1% v/v Applied 24 DAP Untreated

  25. Cadre in 2004 Untreated Cadre @ 1.44 ozs/A Agrioil @ 1% v/v Applied 27 DAP PE-10-04 August 4, 2004 55 DAT

  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

  27. 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!!

  28. Reduced Rates of ValorGood 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

  29. Florida Beggarweed Control With Valor (> 56 DAT) Source: Valent

  30. 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%

  31. 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

  32. Spartan Rotation Restrictions

  33. Spartan Injury

  34. 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

  35. www.gaweed.com

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