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Peanut Weed Control Update 2002 UGA Extension Agent Training Eric P. Prostko Extension Weed Specialist Tifton.

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Presentation on theme: "Peanut Weed Control Update 2002 UGA Extension Agent Training Eric P. Prostko Extension Weed Specialist Tifton."— Presentation transcript:

1 Peanut Weed Control Update 2002 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

4 Peanut Acres Treated with Valor and Injury by Region in 2001 0 5,000 10,000 15,000 20,000 25,000 30,000 AtlanticSoutheastOklahomaTexas Acres Acres TreatedAcres Injured Source: Valent USA Corp.

5 Valor Injury

6 Valor Performance Valor No Valor Irwin Co, 2001

7 Peanut Yield As Influenced By PRE Herbicides - 2000 57675769 5456 5838 0 1500 3000 4500 6000 UntreatedStrongarmValorSpartan Herbicide lbs/A Averaged over 2 varieties (GA Green, C99R) * LSD (0.05) = 561 Lang Farm

8 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

9 Peanut Yield in Response to Valor Timings 4673 3960 4221 3680 3394 2496 1567 0 1000 2000 3000 4000 5000 Untreated 0 DAP1 DAP3 DAP5 DAP7 DAP 10 DAP Valor Timing lbs/A GA Green Tifton, GA 2001 a abc ab bc c d e

10 Peanut Yield in Response to Valor Timings 4526 4552 4408 4580 4188 4459 0 1000 2000 3000 4000 5000 0 DAP2 DAP4 DAP6 DAP8 DAP10 DAP Valor Timing lbs/A C-99R Attapulgus, GA 2001 P = 0.66

11 Peanut Yield in Response to Valor Timings 3704 3803 4027 3881 3939 4297 3789 0 1000 2000 3000 4000 5000 Untreated 0 DAP1 DAP3 DAP5 DAP7 DAP 10 DAP Valor Timing lbs/A NC 12C Lewiston, NC 2001 P = 0.56

12 Peanut Yield in Response to Valor Timings 6875 6301 6564 67236731 6476 0 1000 2000 3000 4000 5000 6000 7000 Untreated0 DAP2 DAP4 DAP6 DAP8 DAP Valor Timing lbs/A GA Green Citra, FL 2001 P = 0.31

13 Peanut Yield in Response to Valor Timings 3394 4120 4483 4109 3964 3616 3234 0 1000 2000 3000 4000 5000 Untreated 0 DAP1 DAP3 DAP5 DAP7 DAP 10 DAP Valor Timing lbs/A GA Green Yoakum, TX 2001 P = 0.48

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

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

16 Peanut Yields As Influenced By Ultra Blazer Applications - 2001 (1.5 pts/A + COC 1% v/v) 5265 5649 5330 4883 4758 5415 4533 5491 0 1300 2600 3900 5200 6500 Untreated 30 DAP45 DAP60 DAP74 DAP88 DAP 120 DAP 30 + 88 DAP Timing lbs/A Averaged over 2 varieties (GA Green, C99R) *LSD (0.05) = 311 +LSD (0.10) = 260 Ponder Farm

17 Peanut Yields As Influenced By Ultra Blazer Applications - 2001 (1.5 pts/A + COC 1% v/v) 5239 5704 5470 5631 4842 5241 5696 0 1300 2600 3900 5200 6500 Untreated 30 DAP42 DAP55 DAP82 DAP90 DAP 30 + 90 DAP Timing lbs/A Averaged over 2 varieties (GA Green, C99R) *LSD (0.05) = NS +LSD (0.10) = 534 Plains, GA

18 4112 5139 4457 4529 4868 4136 3947 0 1000 2000 3000 4000 5000 6000 Untreated 23 DAP36 DAP51 DAP65 DAP79 DAP99 DAP Timing Yield (lbs/A) Peanut Yields as Influenced by Ultra Blazer Applications - 2001 (1 qt/A + Induce 0.25% v/v) Averaged over 2 varieties (GA Green, C99R) P = 0.20 Jay, FL

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

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

21 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??

22 TSWV as Influenced by Classic Applications (2000-2001) -15 -10 -5 0 5 10 15 20 0 406080100 Classic Timing (DAE) Change in TSWV (%) 4 trials conducted in GA Averaged over 2 varieties (GA Green and C-99R)

23 Peanut Yield as Influenced by Classic Applications (2000-2001) -1500 -1300 -1100 -900 -700 -500 -300 -100 100 300 020406080100 Classic Timing (DAE) Change in Yield (lbs/A) 2 trials conducted in GA/1 trial conducted in FL Averaged over 2 varieties (GA Green and C-99R) weed-free conditions

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

25 2002 Research Focus tropic croton control (Cadre tank-mixes) dayflower/spiderwort control herbicide/fungicide tank-mixes reduced rates of Strongarm + Valor Classic/TSWV others???

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


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