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A Comparison of Full and Reduced Rate Weed Management Programs in Peanut

A Comparison of Full and Reduced Rate Weed Management Programs in Peanut. E.P. Prostko and T. L. Grey Dept. of Crop & Soil Sciences University of Georgia Tifton. SWSS 2004. The Need for Cheaper Weed Control Strategies. 34% of cost production for agri-chemicals

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A Comparison of Full and Reduced Rate Weed Management Programs in Peanut

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  1. A Comparison of Full and Reduced Rate Weed Management Programs in Peanut E.P. Prostko and T. L. Grey Dept. of Crop & Soil Sciences University of Georgia Tifton SWSS 2004

  2. The Need for Cheaper Weed Control Strategies • 34% of cost production for agri-chemicals • reduction in support price from $619 to $355

  3. Strongarm/Valor Combinations • compliment each other • lower rates • reduced cost • less carryover? • less injury • different MOA • not labeled in 2003

  4. OBJECTIVE • to determine if the combination of 0.25X rates of Strongarm + Valor would provide control equivalent to full rates of either applied alone • Why? * Strongarm @ 0.45 ozs/A = $16.00 * Valor @ 3 ozs/A = $12.90 * Strongarm (0.113 ozs/A) + Valor (0.75 ozs/A) = $7.23/A

  5. Materials and Methods • small plots • irrigated fields • 3-4 replications • 5 trials • late-season ratings • yield data • DNA used for grass control

  6. ResultsCrop Injury

  7. Peanut Stunting - 7 DATAttapulgus 2003 (0.45 ozs/A) (3.0 ozs/A) (0.113 + 0.75 ozs/A) LSD 0.05 = 3

  8. Peanut Stunting - 14 DATTifton 2003 (0.45 ozs/A) (3.0 ozs/A) (0.113 + 0.75 ozs/A) LSD 0.05 = 4

  9. RESULTS - CONTROL2001

  10. Hophornbeam copperleaf control with reduced rates of Strongarm (S) and Valor (V)91 DAP PE-14-01 Randolph Co. LSD 0.05 = 13

  11. Hophornbeam Copperleaf ControlRandolph County, GA - 2001 Strongarm (0.45 ozs/A) Valor (3 ozs/A) Strongarm 0.113 ozs + Valor 0.75 ozs/A Untreated 6 WAT

  12. RESULTS - CONTROL2002

  13. FL Beggarweed control with reduced rates of Strongarm (S) and Valor (V)91 DAP PE-09-02 Attapulgus LSD 0.05 = 8

  14. Smallflower morningglory control with reduced rates of Strongarm (S) and Valor (V)91 DAP PE-09-02 Attapulgus LSD 0.05 = 2

  15. Common ragweed control with reduced rates of Strongarm (S) and Valor (V)91 DAP PE-09-02 Attapulgus LSD 0.05 = 7

  16. Weed control in peanuts with reduced rates of Strongarm and Valor, 2002. Strongarm 0.45 oz/A Valor 3 oz/A Strongarm 0.113 oz/A + Valor 0.75 oz/A Untreated Attapulgus, GA (7 WAP)

  17. RESULTS - CONTROL2003

  18. FL Beggarweed control with reduced rates of Strongarm (S) and Valor (V)91 DAP PE-01A-03 Tifton LSD 0.10 = 5

  19. Annual MG control with reduced rates of Strongarm (S) and Valor (V)91 DAP PE-01A-03 Tifton LSD 0.10 = 5

  20. Reduced Rates of Strongarm and Valor - I Strongarm 0.45 ozs/A Untreated Valor 3 ozs/A Strongarm 0.113 ozs/A + Valor 0.75 ozs/A PE-01A-03 91 DAP

  21. Bristly starbur control with reduced rates of Strongarm (S) and Valor (V)91 DAP PE-01B-03 Attapulgus LSD 0.10 = 5

  22. Common ragweed control with reduced rates of Strongarm (S) and Valor (V)91 DAP PE-01B-03 Attapulgus LSD 0.10 = 20

  23. Reduced Rates of Strongarm and Valor - II Untreated Strongarm 0.45 ozs/A Valor 3 ozs/A Strongarm 0.113 ozs/A + Valor 0.75 ozs/A PE-01B-03 91 DAP

  24. Tropical spiderwort control with reduced rates of Strongarm (S) and Valor (V) (LSD 0.05 = 11) (LSD 0.05 = 11) (LSD 0.05 = 11) (LSD 0.05 = 15) (LSD 0.05 = 22) PE-24-03 Grady County

  25. RESULTS - YIELD2003

  26. Peanut Yield Response to Reduced Rates of Strongarm (S) and Valor (V) - I PE-01A-03 Tifton LSD 0.10 = 612

  27. Peanut Yield Response to Reduced Rates of Strongarm (S) and Valor (V) - Ifb Cadre (ozs/A) PE-01A-03 Tifton LSD 0.10 = 612

  28. Peanut Yield Response to Reduced Rates of Strongarm (S) and Valor (V) - II PE-01B-03 Attapulgus LSD 0.10 = 585

  29. Peanut Yield Response to Reduced Rates of Strongarm (S) and Valor (V) - IIfb Cadre (ozs/A) PE-01B-03 Attapulgus LSD 0.10 = 585

  30. SummaryReduced Rates • less injurious than Valor at full rate • similar weed control except for tropical spiderwort and annual mg • when used in total program (pre + post), equivalent yields when compared to full rate programs • digging efficiency/weed seed bank concerns?

  31. ACKNOWLEDGMENTS • This research was partially funded through a grant provided by the Georgia Agricultural Commodity Commission for Peanuts

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