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Peanut Response to Valor Application Timings

Peanut Response to Valor Application Timings. E. P. Prostko and W. C. Johnson III, (GA) W. J. Grichar (TX) D. L. Jordan (NC) G. A. MacDonald (FL). Valor in Peanuts. labeled on April 12, 2001 G-E broadleaf weed control minimal rotation restrictions narrow application window

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Peanut Response to Valor Application Timings

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  1. Peanut Response to Valor Application Timings E. P. Prostko and W. C. Johnson III, (GA) W. J. Grichar (TX) D. L. Jordan (NC) G. A. MacDonald (FL)

  2. Valor in Peanuts • labeled on April 12, 2001 • G-E broadleaf weed control • minimal rotation restrictions • narrow application window • unexpected injury

  3. Peanut Acres Treated with Valor and Injury by Region in 2001 Source: Valent U.S.A. Corp.

  4. Objective • To evaluate the effects of the timing of Valor on peanut growth, yield, and maturity.

  5. Material and Methods • 5 locations • small plot techniques • 3-4 replications • Valor (3 oz/A) applied 0 to 10 DAP • weed-free conditions • crop injury, yield, maturity

  6. Materials and Methods

  7. Materials and Methods • applications made after 3 DAP are off label • peanuts were cracking or emerged on or after…… * GA1 - 7 DAP * GA2 - 10 DAP * FL - 8 DAP * NC - 7 DAP * TX - 7 DAP

  8. RESULTSCrop Injury

  9. Crop Injury Summary- IStunting/Leaf Burn • GA1 - all timings caused significant crop injury (25-88%) • GA2 - significant crop injury 6, 8, and 10 DAP (13-33%) • FL - no crop injury was observed

  10. Crop Injury Summary - IIStunting/Leaf Burn • NC - significant crop injury when applied 7 and 10 DAP (9-18%). • TX - significant crop injury when applied 7 and 10 DAP (10-30%).

  11. Valor Injury

  12. RESULTSYield

  13. Peanut Yield in Response to ValorTifton, GA a ab abc bc c d e

  14. Peanut Yield in Response to ValorAttapulgus, GA P = 0.66

  15. Peanut Yield in Response to ValorCitra, FL P = 0.31

  16. Peanut Yield in Response to Valor Lewiston, NC P = 0.56

  17. Peanut Yield in Response to Valor Yoakum, TX P = 0.48

  18. RESULTSMaturity

  19. Peanut Maturity in Response to ValorBlack Hulls a b b b b b c GA Green Planted: May 8 Tifton, GA September 19, 2001

  20. Peanut Maturity in Response to ValorBlack + Brown Hulls a ab bc bc bc b c GA Green Planted: May 8 Tifton, GA September 19, 2001

  21. Peanut Maturity in Response to ValorOrange + Yellow Hulls a ab ab ab b bc c GA Green Planted: May 8 Tifton, GA September 19, 2001

  22. Summary - I • Valor caused significant crop injury, particularly when applied at 6 DAP or later. • Peanuts yields were not reduced by any application of Valor in 4 out of 5 tests.

  23. Summary - II • In Tifton, GA, Valor caused significant yield reductions when applied 3 DAP or later. • In Tifton, GA peanut maturity was delayed (7-14 days) as indicated by differences in hull color at harvest.

  24. Valor in Peanuts - 2002Suggestions • calibration • pre-slurry • plant 1.5” deep • apply at planting • do not irrigate when cracking • hull scrape • limited acreage

  25. University of Georgia Extension Weed Science (gaweed.com)

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