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What’s Happening in Weed Control 2001

What’s Happening in Weed Control 2001. Dr. Eric P. Prostko Extension Weed Specialist Tifton. Certified Crop Advisors Meeting, Dec 15, 2000, Tifton GA. Topic for Discussion. 2000 Problems peanuts cotton corn soybeans. How dry was it??? May Precipitation in Georgia.

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What’s Happening in Weed Control 2001

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  1. What’s Happening in Weed Control 2001 Dr. Eric P. Prostko Extension Weed Specialist Tifton Certified Crop Advisors Meeting, Dec 15, 2000, Tifton GA

  2. Topic for Discussion • 2000 Problems • peanuts • cotton • corn • soybeans

  3. How dry was it???May Precipitation in Georgia 85-90% of GA peanuts were planted in May

  4. Drift Problems in 2000 Staple Plus on Sorghum Roundup on Peanuts

  5. nozzle selection reduce pressure lower boom height increase nozzle size avoid spraying when winds exceed 10 MPH lookout for inversions use additives calibrate sprayer keep records use common sense Top 10 Tips For Reducing Pesticide Drift Problems

  6. “The Year of the Pigweed” • dry weather • incorporation • big weeds • Palmer amaranth • resistance??

  7. Palmer Amaranth Control with Blazer Applied at Different Timings Mayo et al. 1995 (KS)

  8. Pigweed Control with Blazer and Classic - 28 DAT Gossett and Toler, 1999(SC) Applied at V3-V4 stage

  9. Pigweed IdentificationWorld Wide Web • Iowa State University * http://www.weeds.iastate.edu/weed-id/ waterhemp/default.htm • Kansas State University * http://www.oznet.ksu.edu/library/crpsl2/s80.pdf

  10. PEANUTS

  11. 11% of peanut market in southeast - 2000

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

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

  14. Strongarm - Does it work in GA?Attapulgus - 7 WAP Strongarm + Prowl (PPI) Untreated

  15. Variety Tolerance to Strongarm (PRE) Tifton, GA 2000 Weed-free test Averaged over 2 varieties (GA Green, C99R) LSD 0.05 = 561

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

  17. Strongarm Label Update2001 • “at cracking” applications • Snapbean rotation = 9 months

  18. Valor 50WDG • Valent • introduced in 1989 • flumioxazin • N-phenylphthalimide derivative • PPO oxidase inhibitor • PRE • 2-3 ozs/A • label in 2001 (I hope!!)

  19. Why do we need Valor?? • Florida beggarweed • rotation restrictions • mode of action • reduced costs/A?

  20. 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

  21. Other Peanut Weed Control Issues • paraquat formulations * Starfire (old) * Gramoxone Max * Boa • Ultra Blazer * sodium salt vs. amine formulation * less peanut injury???

  22. COTTON

  23. GMO Cotton Varieties in GA Source: NASS, June 2000

  24. Top 12 Varieties in 2000 GA Crop

  25. Roundup Ready Programs

  26. Glyphosate formulations(labeled for OT uses on RR cotton) * not Touchdown 5L

  27. Glyphosate is a good herbicide but it does have some weaknesses such as ….. • morningglory • nutsedge • dayflower • hemp sesbania • prickly sida • Florida pusley

  28. Say Bye Bye to Bladex (cyanazine) • no sales or distribution after 9/30/02 • cannot be used after 12/31/02 • Does anyone have some??

  29. diuron prometryn fluometuron Cobra Goal Harvade Valor glyphosate Cyanazine Replacements

  30. Cyanazine ReplacementsIssues • Contact activity (CoA) • Residual activity (R) • Carryover potential (CaP) • Injury potential (I) • Cost ($)

  31. Cyanazine ReplacementsStrengths / Weaknesses • diuron -- CoA, R, I, $ / CaP? • prometryn -- CoA, R, CaP, I, $ • fluometuron -- R, I, $ / CoA, CaP? • Cobra -- CoA, CaP, I / R, $ • Goal -- CoA, CaP, I / R, $ • Harvade -- CoA, CaP, $ (IPOZZ) / R • Valor -- CoA, R, CaP / I, $? experimental • Glyphosate -- CoA, CaP, $ / R only RR

  32. Conventional Programs

  33. CORN

  34. Weed Control in Corn • numerous options • tough to beat atrazine + cultivation ($$$) • Prowl and/or Accent for PANTE • need something for late-season MG

  35. Weed Control in CornNew Stuff • herbicide resistant hybrids * cost/A * hybrid performance * 6% of U.S. crop * GMO Issue • new labels

  36. Herbicide Resistant Corn Hybrid TechnologiesCost/A

  37. Herbicide Resistant Corn Hybrids in GA - 2000 • hybrids that performed equal to or better than the test averages included the following: * Pioneer 32K63LL (Liberty) * Garst 8222 IT (Clearfield) * Dekalb 626RR (Roundup)

  38. Accent Gold Action Axiom Axiom AT Aim Balance Celebrity Plus Distinct Degree Extra Epic Northstar Spirit Weed Control in CornNew (er) Labels

  39. SOYBEANS

  40. GA Soybean Production1989-2000 Source: GASS

  41. Weed Control in SoybeansRoundup Ready Tank-Mixes • Classic @ 0.33 oz/A ($3.14) • FirstRate @ 0.15 ozs/A ($3.11) • Resource @ 4 ozs/A ($4.30) • improved control of morningglory (5-10%) • mixed results across southern US • cheaper than split applications of Roundup but not as effective

  42. Newer Roundup PremixesSoybeans • BASF • Extreme *Roundup (2 lb/gal) + Pursuit (0.17 lb/gal) • Backdraft *Roundup (1.25 lb/gal) + Scepter (0.25 lb/gal) • knockdown + residual • NIS + N required on label

  43. Roundup/Boron/DimilinTank Mixes?? • full-bloom to early pod-fill • R2-R3 stage • Is this the best time for Roundup? • Crop injury? • Need more data

  44. Soybean Yield Response to Roundup/Boron/Dimilin Tank-MixesHartz 7550RR Bu/A P = 0.85 CV = 23 Tifton, GA 2000

  45. Action Axiom Boundary Detail Domain Expert Pendimax Raptor Resource Weed Control in SoybeansOther New(er) Stuff

  46. http://mars.cropsoil.uga.edu/weedsci/ University of Georgia Extension Weed Science

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