Slide Presentation

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Peanut Weed Control Update 2009 (County Extension Agents)

AUTHOR
Eric P. Prostko
Extension Weed Specialist
Department of Crop and Soil Sciences
University of Georgia

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TABLE OF CONTENTS
  1. Peanut Weed Control Update 2009 (County Extension Agents)
  2. Topics for Discussion
  3. Fusilade in Peanuts
  4. Fusilade/Bristly Starbur
  5. Reflex in Peanuts
  6. Reflex vs. Valor (AP-3) Attapulgus, GA (38 DAT)
  7. Reflex vs. Valor (AP-3) Attapulgus, GA (38 DAT)
  8. Peanut Yield (Georgia Green) Response to Reflex 2L
  9. 2008 Research I just had to know for sure!!!!
  10. Peanut Yield Response to Contaminated 2,4-DB, 2008
  11. Some facts that should scare you!
  12. Palmer Amaranth Control in Peanuts
  13. GR-Pigweed Control in Peanuts - 2008 Macon County - 91 DAP
  14. If residual herbicides are not activated on a timely basis with a reliable water source, pigweed control will be very difficult, maybe even impossible!
  15. May 2008 Rainfall Distribution in Tifton (CPES)
  16. May-June 2008 Rainfall Distribution in Midville
  17. Dryland Systems
  18. What about the generic formulations of metolachlor?
  19. Palmer Amaranth Control in Peanut with Dual Magnum and Stalwart
  20. Will these herbicides control large pigweeds?
  21. GR-Pigweed Control in Peanuts - 2008 Macon County - 91 DAP
  22. GR-Pigweed Control in Peanuts - 2008 Macon County - 91 DAP
  23. Palmer Amaranth Control with Ultra Blazer and 2,4-DB - 2008
  24. Palmer Amaranth Control with Cobra and 2,4-DB - 2008
  25. 2,4-DB fb Cobra or Ultra Blazer????? (has only been successful Ό times)
  26. Rope-wick Applicators
  27. Grass Works Weed Wiper
  28. For More Weed Science Info



SLIDE CONTENTS
  1. Peanut Weed Control Update 2009 (County Extension Agents) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia
  2. Topics for Discussion New Stuff Fusilade?? Reflex?? 2007 Contaminated 2,4-DB PIGWEED
  3. Fusilade in Peanuts Label in 2009? How does it compare to Poast (P) or Select (S)??? Grass Weeds Bermudagrass (F=S>P) B. signalgrass (P=S>F) Goosegrass (F=P=S) TX panicum (P=S>F) Crabgrass (P=S>F) Bristly starbur control?
  4. Fusilade/Bristly Starbur Source: Dr. Greg MacDonald University of Florida
  5. Reflex in Peanuts Label in 2011? PRE, POST Good on pigweed, yellow nutsedge, bristly starbur Not so good on FL. beggarweed
  6. Reflex vs. Valor (AP-3) Attapulgus, GA (38 DAT) Reflex 2L @ 12 oz/A Valor SX 51WG @ 3 oz/A PE-11-08
  7. Reflex vs. Valor (AP-3) Attapulgus, GA (38 DAT) Reflex 2L @ 16 oz/A Valor SX 51WG @ 3 oz/A PE-11-08
  8. Peanut Yield (Georgia Green) Response to Reflex 2L PE-09-08 Ponder Farm * * * * * * Significantly different from NTC (P = 0.10) CRACK = VE-V2; 20% emergence EPOST = V6; 2-3’ tall
  9. 2008 Research I just had to know for sure!!!! Small plot research Contaminated 2,4-DB 24 oz/A + COC @ 1% Applied at various stages (28, 45, 62, 78, 91, and 105 DAP) Irrigated peanuts Weed-free Twin-row AP-3 Visual observations yield
  10. Peanut Yield Response to Contaminated 2,4-DB, 2008 24 oz/A + 1% Peptoil P = 0.2142 CV = 8
  11. Some facts that should scare you! 1 Palmer amaranth plant per meter (3.2 ft) of row can reduce peanut yield by 28%. 1 Palmer amaranth plant per meter (3.2 ft) of crop row can result in the production of ~162,000,000 seed/acre. Source: Burke et al., 2007. Weed Technology 21:367-371
  12. Palmer Amaranth Control in Peanuts Start Clean!!!!! Use a residual!!! Do you have ALS or DNA resistance? Are you willing to use Valor? Dryland or Irrigated? Spray when plants are small (<3”) Rope-wick Applications
  13. GR-Pigweed Control in Peanuts – 2008 Macon County – 91 DAP NTC Prowl H2O @ 2.1 pt/A (PRE) Valor SX 51WG @ 3 oz/A (PRE) Cadre 2AS @ 4 oz/A (41 DAP)+ Peptoil @ 1% v/v (41 DAP)
  14. If residual herbicides are not activated on a timely basis with a reliable water source, pigweed control will be very difficult, maybe even impossible!
  15. May 2008 Rainfall Distribution in Tifton (CPES) Dryland crops planted before May 9 or after May 16 did not get enough rain to activate residual herbicides!!! First rainfall event > 0.5” in June occurred on June 15 (1.03”) 0.33” 0.02” 0.06”
  16. May-June 2008 Rainfall Distribution in Midville Crops planted from May 21-June 21 did not receive enough rainfall to activate herbicides (0.26” total). June Rainfall = 0.62” which occurred as follows:12 (0.08”); 22 (0.36”); 26 (0.08”); 29 (0.10”)
  17. Dryland Systems Growers need to think about mechanical herbicide incorporation Will help but not a guarantee Success will depend upon…… operator implement soil conditions Dual Magnum PPI (1 pt/A) POST (1 pt/A)
  18. What about the generic formulations of metolachlor? Me-Too-Lachlor, Parallel PCS, Stalwart Yes, they are cheaper. 1 pt/A Dual Magnum = $10.38 Stalwart = $4.75 Frequently, but not always, they do not last as long as Dual Magnum
  19. Palmer Amaranth Control in Peanut with Dual Magnum and Stalwart PE-03-07 Both applied at 1 pt/A *Significantly different at 53 DAT and 94 DAT (P = 0.10) * *
  20. Will these herbicides control large pigweeds?
  21. GR-Pigweed Control in Peanuts – 2008 Macon County – 91 DAP NTC Prowl H2O @ 2.1 pt/A (PRE) Gramoxone Inteon @ 12 oz/A (21 DAP) + Storm @ 1 pt/A + LI-700 @ 0.25% v/v (21 DAP) Cadre @ 4 ozA (41 DAP) + Peptoil @ 1% v/v (41 DAP)
  22. GR-Pigweed Control in Peanuts – 2008 Macon County – 91 DAP NTC Prowl H2O @ 2.1 pt/A (PRE) Ultra Blazer @ 1 pt/A (21 DAP) + LI-700 @ 0.25% v/v (21 DAP) Cobra 2EC @ 12.5 oz/A (41 DAP) + Peptoil @ 1% v/v (41 DAP)
  23. Palmer Amaranth Control with Ultra Blazer and 2,4-DB - 2008 NTC Ultra Blazer @ 1.5 pt/A LI-700 @ 0.25% v/v Treatments applied to 2-10” tall pigweed , 6.23” average height Photo 16 DAT Ultra Blazer @ 1.5 pt/A 2,4-DB @ 18 oz/A LI-700 @ 0.25% v/v
  24. Palmer Amaranth Control with Cobra and 2,4-DB - 2008 NTC Cobra @ 12.5 oz/A 2,4-DB @ 18 oz/A Peptoil @ 1% v/v Treatments applied to 2-10” tall pigweed , 6.23” average height Photo 16 DAT Cobra @ 12.5 oz/A Peptoil @ 1% v/v
  25. 2,4-DB fb Cobra or Ultra Blazer????? (has only been successful Ό times) POST: June 5 (17” tall pigweed) POST2: June 9 Photos taken 24 days after POST application Untreated Cobra 2EC @ 12.5 oz/A Agrioil @ 1% v/v POST 2,4-DB 1.75SL @ 1.1 pt/A + Agrioil @ 1% v/v (POST) fb Cobra 2EC @ 12.5 oz/A Agrioil @ 1% v/v POST2
  26. Rope-wick Applicators Only thing labeled (sort of) is glyphosate Label says row middles At this time of year, yields not influenced Benefits Harvestability Fungicide spray deposition Seed bank REVENGE!!!!
  27. Grass Works Weed Wiper
  28. For More Weed Science Info www.gaweed.com