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Peanut Weed Control Update 2001

Peanut Weed Control Update 2001. Dr. Eric P. Prostko Extension Weed Specialist University of Georgia Tifton. Topic for Discussion. Cadre * reduced rates * cotton rotations paraquat Strongarm Valor other stuff. Reduced Rates of Cadre?. efficacy issues rotation issues liability.

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Peanut Weed Control Update 2001

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  1. Peanut Weed Control Update 2001 Dr. Eric P. Prostko Extension Weed Specialist University of Georgia Tifton

  2. Topic for Discussion • Cadre * reduced rates * cotton rotations • paraquat • Strongarm • Valor • other stuff

  3. Reduced Rates of Cadre? • efficacy issues • rotation issues • liability

  4. The Response of Weeds to Various Cadre Rates in Georgia Webster et al. 1997 Applied EPOST (C-2L)

  5. The Response of Weeds to Various Cadre Rates in Georgia Webster et al. 1997 Applied EPOST (C-2L)

  6. The Response of Weeds to Various Cadre Rates in Georgia Webster et al. 1997 Applied EPOST(C-2L)

  7. Reduced rates of Cadre work if…... • the weed is susceptible • good growing conditions exist • the application is timely (small weeds) Full rates help to overcome variability of application due to weed size, improper sprayer calibration, environmental conditions, etc.

  8. Cadre/Cotton Rotation Issue • new research results

  9. Cotton Response to Cadre Residues in North Carolina York et al., 2000 DES 119

  10. Cotton Yield Response to PPI Applications of Cadre * * Averaged over 2 varieties (DP33B, SG501BG/RR) LSD 0.05 = 336 Tifton, GA 2000

  11. Cotton Yield Response to PRE Applications of Cadre * * * Averaged over 2 varieties (ST4892RR/BG, ST4691BG) LSD 0.05 = 712 Plains, GA 2000

  12. Cotton Variety Response to Cadre at 8 PPB - 9 WAT Culpepper, 2000 Tifton, GA LSD 0.05 = 17

  13. Cotton Variety Response to Cadre at 16 PPB - 9 WAT Culpepper, 2000 Tifton, GA LSD 0.05 = 17

  14. Cadre Carryover in CottonBrooks County - 2000 674 lbs 770 lbs 770 lbs 738 lbs/A (lint yield) 1540 lbs 1348 lbs 1220 lbs 1369 lbs/A 6/09/00

  15. Cadre/Cotton RotationsWhat can growers do? • follow 18 month restriction • reduced rates of Cadre? • Cadre on irrigated fields only? • optimum pH and nutrient levels • plant suspect fields last

  16. Paraquat Formulations

  17. Smallflower Morningglory Control with Various Formulations of ParaquatTest 1 - 15 DAT (P = 0.15) Averaged over 3 rates of Basagran Tifton, GA 2000

  18. Weed Control with Various Paraquat FormulationsTest 2 - 5 DAT (P = 0.72) (P = 0.45) (P = 0.15) Averaged over 3 rates of Basagran Tifton, GA 2000

  19. Weed Control with Various Paraquat FormulationsTest 2 - 14 DAT (P = 0.53) (P = 0.82) (P = 0.40) Averaged over 3 rates of Basagran Tifton, GA 2000

  20. Improving At-Crack Applications • calibrate sprayer • SMALL WEEDS (2”) • nozzle selection (XR TeeJet, TwinJet) • higher water volumes (15 GPA+) improve coverage • lower pressures (30 PSI) reduce drift and evaporation

  21. How would you rate the overall performance of Strongarm in your county? 2000 UGA County Agent Survey

  22. What were the weeds that most frequently escaped control of Strongarm? 2000 UGA County Agent Survey

  23. Strongarm - Does it work?Attapulgus - 7 WAP Strongarm + Prowl (PPI) Untreated PE-01-00

  24. Untreated Strongarm ($23.50/A) Strongarm fb Cadre - 1 oz/A COC - 1% v/v ($44.77/A) Gramoxone Max - 5.5 oz/A Storm - 1 pt/A 2,4-DB - 1 pt/A NIS - 0.125% v/v fb Cadre - 1 oz/A COC - 1% v/v ($35.14/A) 28 DAT

  25. StrongarmHow Should It Be Used in GA? • use where starbur, eclipta, poinsettia, and copperleaf are problems • tank-mix with DNA • irrigate in if possible • variable on nutsedge • poor sicklepod control

  26. Strongarm Label Update2001 • “at cracking” applications • split applications • snapbean rotation = 9 months

  27. Strongarm/Cadre CombinationsConcerns? • cost/A • rotations * peanut (anytime) * soybeans (9 m) * snapbean (9 m) * IR corn (10 m) • ALS resistance

  28. Valor 50WDG • Valent • flumioxazin • N-phenylphthalimide derivative • PPO oxidase inhibitor • PRE • 2-3 ozs/A • label in April 2001 (I hope!!)

  29. Why do we need Valor?? • Florida beggarweed • rotation restrictions • mode of action • reduced costs/A? • market competition But, it is not the Holy Grail!!

  30. Why does Valor have to be applied PRE in peanuts? • PPI treatments less effective

  31. Bristly Starbur Control with Valor @ 3 ozs/A Attapulgus, 2000

  32. Why does Valor have to be applied PRE in peanuts? • PPI treatments less effective • POST treatments can cause excessive crop injury!

  33. Valor Injury on Peanuts

  34. Although Valor has many strengths, growers/dealers need to be made aware of its weaknesses such as . . . . • cocklebur • nutsedge • sicklepod • increased crop injury with delayed applications

  35. Do soil applied herbicides cause yield reductions?

  36. Peanut Yield As Influenced By PRE Herbicides Averaged over 2 varieties (GA Green, C99R) * LSD (0.05) = 561 weed-free

  37. Reduced Tillage Weed Control Research Results • 2,4-D, Clarity, and Harmony Extra

  38. Peanut yield response to preplant herbicide applications in Georgia, 2000. (0.5 pt/A) (0.6 oz/A) *Averaged over 4 locations (P = 0.45)

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

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