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Peanut Weed Control Update 2002 UGA Extension Agent Training

Peanut Weed Control Update 2002 UGA Extension Agent Training. Eric P. Prostko Extension Weed Specialist Tifton. Topics for Discussion. Valor Problems Ultra Blazer Injury Classic Concerns “herbicides on the horizon” 2002 Research. 30,000. 25,000. 20,000. Acres. 15,000. 10,000.

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Peanut Weed Control Update 2002 UGA Extension Agent Training

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  1. Peanut Weed Control Update2002 UGA Extension Agent Training Eric P. Prostko Extension Weed Specialist Tifton

  2. Topics for Discussion • Valor Problems • Ultra Blazer Injury • Classic Concerns • “herbicides on the horizon” • 2002 Research

  3. 30,000 25,000 20,000 Acres 15,000 10,000 5,000 0 Atlantic Southeast Oklahoma Texas Acres Treated Acres Injured Peanut Acres Treated with Valor and Injury by Region in 2001 Source: Valent USA Corp.

  4. Valor Injury

  5. Valor Performance Valor No Valor Irwin Co, 2001

  6. 6000 5838 5767 5769 5456 4500 lbs/A 3000 1500 0 Untreated Strongarm Valor Spartan Herbicide Peanut Yield As Influenced By PRE Herbicides - 2000 Averaged over 2 varieties (GA Green, C99R) * LSD (0.05) = 561 Lang Farm

  7. Valor Timing Tests - 2002 • 5 locations • small plot techniques • Valor (3 oz/A) applied 0 to 10 DAP • weed-free conditions • crop injury, yield, maturity

  8. 5000 4673 4000 4221 3960 3680 3000 3394 lbs/A 2496 2000 1567 1000 0 0 DAP 1 DAP 3 DAP 5 DAP 7 DAP 10 DAP Untreated Valor Timing Peanut Yield in Response to Valor Timings a ab abc bc c d e GA Green Tifton, GA 2001

  9. 5000 4580 4552 4526 4459 4408 4000 4188 3000 lbs/A 2000 1000 0 0 DAP 2 DAP 4 DAP 6 DAP 8 DAP 10 DAP Valor Timing Peanut Yield in Response to Valor Timings C-99R Attapulgus, GA 2001 P = 0.66

  10. 5000 4000 4297 4027 3939 3881 3803 3789 3704 3000 lbs/A 2000 1000 0 0 DAP 1 DAP 3 DAP 5 DAP 7 DAP 10 DAP Untreated Valor Timing Peanut Yield in Response to Valor Timings NC 12C Lewiston, NC 2001 P = 0.56

  11. 7000 6875 6723 6731 6564 6000 6476 6301 5000 4000 lbs/A 3000 2000 1000 0 Untreated 0 DAP 2 DAP 4 DAP 6 DAP 8 DAP Valor Timing Peanut Yield in Response to Valor Timings GA Green Citra, FL 2001 P = 0.31

  12. 5000 4483 4000 4120 4109 3964 3616 3000 3394 3234 lbs/A 2000 1000 0 0 DAP 1 DAP 3 DAP 5 DAP 7 DAP 10 DAP Untreated Valor Timing Peanut Yield in Response to Valor Timings GA Green Yoakum, TX 2001 P = 0.48

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

  14. Ultra Blazer in Peanuts • new formulation • G-E control of croton, ragweed, mg, pigweed, etc • Concerns * crop injury * yield loss???

  15. 6500 5649 5491 5415 5330 5265 4883 4758 5200 4533 3900 lbs/A 2600 1300 0 30 DAP 45 DAP 60 DAP 74 DAP 88 DAP 120 DAP Untreated 30 + 88 DAP Timing Peanut Yields As Influenced By Ultra Blazer Applications - 2001(1.5 pts/A + COC 1% v/v) Averaged over 2 varieties (GA Green, C99R) *LSD (0.05) = 311 +LSD (0.10) = 260 Ponder Farm

  16. 6500 5696 5704 5631 5470 5239 5241 4842 5200 3900 lbs/A 2600 1300 0 30 DAP 42 DAP 55 DAP 82 DAP 90 DAP Untreated 30 + 90 DAP Timing Peanut Yields As Influenced By Ultra Blazer Applications - 2001(1.5 pts/A + COC 1% v/v) Averaged over 2 varieties (GA Green, C99R) *LSD (0.05) = NS +LSD (0.10) = 534 Plains, GA

  17. Peanut Yields as Influenced by Ultra Blazer Applications - 2001 (1 qt/A + Induce 0.25% v/v) 6000 5139 4868 5000 4529 4457 4136 4112 3947 4000 Yield (lbs/A) 3000 2000 1000 0 23 DAP 36 DAP 51 DAP 65 DAP 79 DAP 99 DAP Untreated Timing Averaged over 2 varieties (GA Green, C99R) P = 0.20 Jay, FL

  18. Ultra Blazer in Peanuts • small weeds • before 65 DAP • surfactant • 0.5-1.5 pts/A

  19. Classic Issues in Peanut • 20-25% of acreage • late-season beggarweed • tolerance of new varieties • influence on TSWV

  20. Does Classic have an influence on TSWV in peanut? • Studies conducted in 2000-2001 indicate….. • Classic can increase TSWV but not always. • Classic/TSWV interaction can reduce yields but not always. • Earlier applications??

  21. 20 15 10 5 Change in TSWV (%) 0 0 20 40 60 80 100 -5 -10 -15 Classic Timing (DAE) TSWV as Influenced by Classic Applications (2000-2001) 4 trials conducted in GA Averaged over 2 varieties (GA Green and C-99R)

  22. 300 100 -100 0 20 40 60 80 100 -300 -500 Change in Yield (lbs/A) -700 -900 -1100 -1300 -1500 Classic Timing (DAE) Peanut Yield as Influenced by Classic Applications (2000-2001) 2 trials conducted in GA/1 trial conducted in FL Averaged over 2 varieties (GA Green and C-99R) weed-free conditions

  23. “Herbicides on the Horizon”?? • Spartan (FMC) * broadleaf/y. nutsedge * crop injury concerns * cotton rotations • Callisto (Syngenta) * preemergence * broadleaf weeds * early development

  24. 2002 Research Focus • tropic croton control (Cadre tank-mixes) • dayflower/spiderwort control • herbicide/fungicide tank-mixes • reduced rates of Strongarm + Valor • Classic/TSWV • others???

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

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