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Tolerance of 'New' Peanut Varieties to 'Old' Herbicides

AUTHOR
E. P. Prostko and T.L. Grey
Department of Crop & Soil Sciences
The University of Georgia

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TABLE OF CONTENTS
  1. Tolerance of 'New' Peanut Varieties to 'Old' Herbicides
  2. What did we use to plant in Georgia???
  3. The Future of Peanut Varieties???
  4. The Problem
  5. Materials and Methods
  6. Gramoxone/Firestorm/Parazone (paraquat)
  7. Peanut Variety Response to Gramoxone Max @ 5.5 ozs/A (0.129 lb ai/A) - 2003
  8. Peanut Response to Gramoxone Max @ 5.5 ozs/A (0.129 lb ai/A) - 2004.
  9. Gramoxone Inteon (GI) and Basagran (B) Effects on Peanut Yield of GA-02C (2006)
  10. Gramoxone Inteon (GI) and Basagran (B) Effects on TSWV of GA-02C (2006) - 131 DAP
  11. Gramoxone Inteon (GI) and Basagran (B) Effects on Pod Color of GA-02C (2006) at Harvest
  12. Classic (chlorimuron) @ 0.5 ozs/A Applied 62 DAE
  13. Classic Effects on TSWV in AP-3 (2005) - 128 DAP
  14. Classic Effects on TSWV in AP-3 (2006) - 131 DAP
  15. Classic Effects on Peanut Yield (AP-3) 2005
  16. Classic Effects on Peanut Yield (AP-3) 2006
  17. Classic Effects on TSWV in GA-02C (2006) - 131 DAP
  18. Classic Effects on Peanut Yield (GA-02C) - 2006
  19. Peanut Yield as Influenced by Classic Applications (2000-2006)
  20. Paraquat - Summary
  21. Chlorimuron - Summary
  22. UGA Weed Science



SLIDE CONTENTS
  1. Tolerance of “New” Peanut Varieties to “Old” Herbicides E. P. Prostko and T.L. Grey Department of Crop & Soil Sciences The University of Georgia APRES - 2007
  2. What did we use to plant in Georgia??? 1985 47% Florunner 32% GK-7 9% Southern Runner 1995 25% Florunner 39% GK-7 21% Georgia Runner 2003 88% Georgia Green 6% C-99R 1% Georgia-O2C Source: UGA Extension Agent Surveys
  3. The Future of Peanut Varieties??? AP-3 Georgia-02C C-99R Georgia-03L York McCloud Florida-07 Georgia-06G Georgia Greener Others???
  4. The Problem Herbicides developed for use in peanut prior to 1996 have not been adequately tested on new varieties. Peanut breeding programs are very active and new varieties are being released every year. Can we assume that the herbicide tolerance of new peanut varieties is the same as those previously tested? Testing all varieties and all herbicides is probably impossible.
  5. Materials and Methods Twin rows Small plot techniques backpack sprayer 15 GPA flat-fan nozzle tips 4 replications ANOVA (P = 10) Weed-free all year DNA + Strongarm + Valor Hand-weeding Paraquat Gramoxone Inteon/Firestorm/ Parazone Chlorimuron (Classic) Yield/TSWV
  6. Gramoxone/Firestorm/Parazone (paraquat) Gramoxone Inteon @ 8 ozs/A 80/20 @ 0.25% v/v 7 DAC 1 DAT Gramoxone Inteon @ 12 ozs/A Pledge @ 8 ozs/A 80/20 @ 0.25% v/v 7 DAC
  7. Peanut Variety Response to Gramoxone Max @ 5.5 ozs/A (0.129 lb ai/A) - 2003 Included NIS @ 0.25% v/v LSD 0.10 = 382 * * * *
  8. Peanut Response to Gramoxone Max @ 5.5 ozs/A (0.129 lb ai/A) - 2004. Averaged over 3 varieties (GA Green, C99-R, DP-1) LSD 0.10 = 238 *
  9. Gramoxone Inteon (GI) and Basagran (B) Effects on Peanut Yield of GA-02C (2006) Averaged over 4 timings (7, 14, 22, 28 DAC) Included 80/20 @ 0.25% v/v Weed-free P = 0.63
  10. Gramoxone Inteon (GI) and Basagran (B) Effects on TSWV of GA-02C (2006) - 131 DAP Averaged over 4 timings (7, 14, 22, 28 DAC) Included 80/20 @ 0.25% v/v Weed-free P = 0.26
  11. Gramoxone Inteon (GI) and Basagran (B) Effects on Pod Color of GA-02C (2006) at Harvest Averaged over 4 timings (7, 14, 22, 28 DAC) Included 80/20 @ 0.25% v/v Weed-free LSD 0.10 = 2 (orange) LSD 0.10 = 3 (yellow)
  12. Classic (chlorimuron) @ 0.5 ozs/A Applied 62 DAE 7 DAT AP-3 GA-02C
  13. Classic Effects on TSWV in AP-3 (2005) - 128 DAP P = 0.55 Classic @ 0.5 ozs/A + Activator 90 @ 0.25% v/v Weed-free
  14. Classic Effects on TSWV in AP-3 (2006) - 131 DAP P = 0.11 Classic @ 0.5 oz/A + 80/20 @ 0.25% v/v Weed-free
  15. Classic Effects on Peanut Yield (AP-3) 2005 P = 0.59 Classic @ 0.5 ozs/A + Activator 90 @ 0.25% v/v Weed-free
  16. Classic Effects on Peanut Yield (AP-3) 2006 P = 0.66 Classic @ 0.5 ozs/A + 80/20 @ 0.25% v/v Weed-free
  17. Classic Effects on TSWV in GA-02C (2006) - 131 DAP P = 0.21 Classic @ 0.5 oz/A + 80/20 @ 0.25% v/v Weed-free
  18. Classic Effects on Peanut Yield (GA-02C) - 2006 P = 0.37 Classic @ 0.5 ozs/A + 80/20 @ 0.25% v/v Weed-free
  19. Peanut Yield as Influenced by Classic Applications (2000-2006) 12 trials conducted in GA weed-free conditions
  20. Paraquat - Summary 2003 significant variety X timing interaction No effect on C-99R Significant yield loss in DP-1 at 14 DAC Significant yield loss in GA Green with all timings 2004 No variety X timing interaction significant yield loss occurred at 28 DAC 2006 No effect on GA-02C (TSWV or yield) Reduction in orange pods/increase in yellow pods Repeat in 2007 (GA-02C, GA-03L)
  21. Chlorimuron - Summary AP-3 2 years No effect on TSWV or peanut yield Georgia-02C 1 year no effect on TSWV or peanut yield repeat in 2007 (GA-02C, GA-03L)
  22. www.gaweed.com