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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 ,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 UntreatedStrongarmValorSpartan Herbicide lbs/A Averaged over 2 varieties (GA Green, C99R) * LSD (0.05) = 561 Lang Farm

8 Valor Timing Tests 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 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 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 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 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 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 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 (1.5 pts/A + COC 1% v/v) Untreated 30 DAP45 DAP60 DAP74 DAP88 DAP 120 DAP 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 (1.5 pts/A + COC 1% v/v) Untreated 30 DAP42 DAP55 DAP82 DAP90 DAP DAP Timing lbs/A Averaged over 2 varieties (GA Green, C99R) *LSD (0.05) = NS +LSD (0.10) = 534 Plains, GA

18 Untreated 23 DAP36 DAP51 DAP65 DAP79 DAP99 DAP Timing Yield (lbs/A) Peanut Yields as Influenced by Ultra Blazer Applications (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 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 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 ( ) 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 ( ) 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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