Slide Presentation

TITLE    (click title to view slides)
What’s Happening in Weed Control - 2001

AUTHOR
Dr. Eric P. Prostko
Extension Weed Specialist
University of Georgia
Tifton, GA

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TABLE OF CONTENTS
  1. What’s Happening in Weed Control - 2001
  2. Topic for Discussion
  3. How dry was it??? May Precipitation in Georgia
  4. Drift Problems in 2000
  5. Top 10 Tips For Reducing Pesticide Drift Problems
  6. “The Year of the Pigweed”
  7. Palmer Amaranth Control with Blazer Applied at Different Timings
  8. Palmer Amaranth Control with Herbicides Applied at Different Timings
  9. Pigweed Control with Blazer and Classic - 28 DAT
  10. Pigweed Identification: World Wide Web
  11. PEANUTS
  12. Strongarm
  13. How would you rate the overall performance of Strongarm in your county?
  14. What were the weeds that most frequently escaped control of Strongarm?
  15. Strongarm - Does it work in GA? Attapulgus - 7 WAP
  16. Variety Tolerance to Strongarm (PRE) -Tifton, GA 2000
  17. Strongarm: How Should It Be Used in GA?
  18. Strongarm Label Update: 2001
  19. Valor 50WDG
  20. Why do we need Valor??
  21. Although Valor has many strengths, growers/dealers need to be made aware of its weaknesses such as . . . .
  22. Other Peanut Weed Control Issues
  23. COTTON
  24. GMO Cotton Varieties in GA
  25. Top 12 Varieties in 2000 GA Crop
  26. Roundup Ready Programs
  27. Glyphosate formulations (labeled for OT uses on RR cotton)
  28. Glyphosate is a good herbicide but it does have some weaknesses such as . . . .
  29. Say Bye Bye to Bladex (cyanazine)
  30. Cyanazine Replacements
  31. Cyanazine Replacements: Issues
  32. Cyanazine Replacements: Strengths/Weaknesses
  33. Conventional Programs
  34. CORN
  35. Weed Control in Corn
  36. Weed Control in Corn: New Stuff
  37. Herbicide Resistant Corn Hybrid Technologies: Cost/Acre
  38. Herbicide Resistant Corn Hybrids in GA - 2000
  39. Weed Control in Corn: New(er) Labels
  40. SOYBEANS
  41. GA Soybean Production: 1989-2000
  42. Weed Control in Soybeans: Roundup Ready Tank-Mixes
  43. Newer Roundup Premixes: Soybeans
  44. Roundup/Boron/Dimilin Tank Mixes??
  45. Soybean Yield Response to Roundup/Boron/Dimilin Tank-Mixes: Hartz 7550RR
  46. Weed Control in Soybeans: Other New(er) Stuff
  47. UGA Weed Science



SLIDE CONTENTS
  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. Top 10 Tips For Reducing Pesticide Drift Problems 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
  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. Palmer Amaranth Control with Herbicides Applied at Different Timings Mayo et al. 1995 (KS)
  9. Pigweed Control with Blazer and Classic - 28 DAT Gossett and Toler, 1999 (SC) Applied at V3-V4 stage
  10. Pigweed Identification World 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
  11. PEANUTS
  12. PPT Slide 11% of peanut market in southeast - 2000
  13. How would you rate the overall performance of Strongarm in your county? 2000 UGA County Agent Survey
  14. What were the weeds that most frequently escaped control of Strongarm? 2000 UGA County Agent Survey
  15. Strongarm - Does it work in GA? Attapulgus - 7 WAP Untreated Strongarm + Prowl (PPI)
  16. Variety Tolerance to Strongarm (PRE) Tifton, GA 2000 Weed-free test Averaged over 2 varieties (GA Green, C99R) LSD 0.05 = 561
  17. Strongarm How 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
  18. Strongarm Label Update 2001 “at cracking” applications Snapbean rotation = 9 months
  19. Valor 50WDG Valent introduced in 1989 flumioxazin N-phenylphthalimide derivative PPO oxidase inhibitor PRE 2-3 ozs/A label in 2001 (I hope!!)
  20. Why do we need Valor?? Florida beggarweed rotation restrictions mode of action reduced costs/A?
  21. 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
  22. Other Peanut Weed Control Issues paraquat formulations * Starfire (old) * Gramoxone Max * Boa Ultra Blazer * sodium salt vs. amine formulation * less peanut injury???
  23. COTTON
  24. GMO Cotton Varieties in GA Source: NASS, June 2000
  25. Top 12 Varieties in 2000 GA Crop
  26. Roundup Ready Programs
  27. Glyphosate formulations (labeled for OT uses on RR cotton) * not Touchdown 5L
  28. Glyphosate is a good herbicide but it does have some weaknesses such as ….. morningglory nutsedge dayflower hemp sesbania prickly sida Florida pusley
  29. 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??
  30. Cyanazine Replacements diuron prometryn fluometuron Cobra Goal Harvade Valor glyphosate
  31. Cyanazine Replacements Issues Contact activity (CoA) Residual activity (R) Carryover potential (CaP) Injury potential (I) Cost ($)
  32. Cyanazine Replacements Strengths / 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
  33. Conventional Programs
  34. CORN
  35. Weed Control in Corn numerous options tough to beat atrazine + cultivation ($$$) Prowl and/or Accent for PANTE need something for late-season MG
  36. Weed Control in Corn New Stuff herbicide resistant hybrids * cost/A * hybrid performance * 6% of U.S. crop * GMO Issue new labels
  37. Herbicide Resistant Corn Hybrid Technologies Cost/A
  38. 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)
  39. Weed Control in Corn New (er) Labels Accent Gold Action Axiom Axiom AT Aim Balance Celebrity Plus Distinct Degree Extra Epic Northstar Spirit
  40. SOYBEANS
  41. GA Soybean Production 1989-2000 Source: GASS
  42. Weed Control in Soybeans Roundup 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
  43. Newer Roundup Premixes Soybeans 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
  44. Roundup/Boron/Dimilin Tank Mixes?? full-bloom to early pod-fill R2-R3 stage Is this the best time for Roundup? Crop injury? Need more data
  45. Soybean Yield Response to Roundup/Boron/Dimilin Tank-Mixes Hartz 7550RR Tifton, GA 2000 P = 0.85 CV = 23 Bu/A
  46. Weed Control in Soybeans Other New(er) Stuff Action Axiom Boundary Detail Domain Expert Pendimax Raptor Resource
  47. PPT Slide University of Georgia Extension Weed Science http://mars.cropsoil.uga.edu/weedsci/