Slide Presentation

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2023 Common Problems- Survey of Southern Row Crop Extension Weed Specialists

AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. 2023 Common Problems- Survey of Southern Row Crop Extension Weed Specialists
  2. Special Thanks to...
  3. Current Day Extension Weed Specialist at UGA (95% Extension/5% Service)
  4. 2023 Common Problems Survey
  5. 2023 Survey of Southern Row Crop Extension Weed Specialists Common Problems
  6. Off-Target Movement
  7. Off-Target Movement glyphosate + metsulfuron
  8. Off-Target Movement glyphosate + carfentrazone
  9. Sprayer Contamination
  10. Laurens Co. - 2023
  11. Tattnall Co. - 2023
  12. Mixing/Jug Errors
  13. Glyphosate/Peanut
  14. Jugs and Jugs?
  15. Jugs and Jugs? (~$1 million mistake)
  16. Herbicide Carryover Look-Alikes
  17. Pierce Co. - 2023
  18. Macon Co. - March 2023
  19. True Herbicide Carryover
  20. Imazethapyr (Newpath) Carryover to Provisia or Conventional Rice
  21. Imazapic (Cadre) Carryover to Cotton
  22. Picloram (Grazon P+D) Carryover to Peanut
  23. Specialists with Same Rankings
  24. Generally, all of these problems are self-inflicted and could be minimized!
  25. Special Thanks to...
  26. Questions/Comments



SLIDE CONTENTS
  1. Eric P. Prostko Professor/Extension Weed Specialist Dept. Crop & Soil Sciences University of Georgia SWSS/WSSA Joint Annual Meeting – 2024 San Antonio, TX 2023 Common Problems Survey of Southern Row Crop Extension Weed Specialists
  2. Special Thanks to…… Alabama – Steve Li/David Russell Arkansas – Tom Barber/Tommy Butts Florida – Pratep Devkota Georgia – Stanley Culpepper Kentucky – Travis Legleiter Louisiana – Dan Stephenson/Connor Webster Missouri – Kevin Bradley Mississippi – Jason Bond North Carolina – Charlie Cahoon/Wes Everman Oklahoma – Todd Baughman South Carolina – Mike Marshall Tennessee – Larry Steckel Texas – Peter Dotray/Scott Nolte Virginia – Mike Flessner/Vijay Singh
  3. Current Day Extension Weed Specialist at UGA (95% Extension/5% Service) Traditional County Agent #1 Client Grower Meetings Newsletters, fact sheets, popular press articles Trouble-shooting Telephone Modern Applied Research (40-70 field trials) Grad students/J-articles Web-Page/Blog E-mail/I-Phone (texts) Pay for almost everything (grants)
  4. 2023 Common Problems Survey April 2023 21 Southern Row Crop Extension Weed Specialists (14 States) Asked to rank these specific 5 problems Scale: 1 = most common to 5 = least common off-target movement, sprayer contamination, mixing/jug errors, herbicide carryover look-alikes, true herbicide carryover
  5. 2023 Survey of Southern Row Crop Extension Weed Specialists Common Problems (1 = most common, 5 = least common) N = 21 April 2023
  6. Off-Target Movement #1 for 57%
  7. Off-Target Movement glyphosate + metsulfuron Washington Co. May 2023
  8. Off-Target Movement glyphosate + carfentrazone Miller Co. August 2023 0.089 ppm glyphosate
  9. Sprayer Contamination
  10. Laurens Co. - 2023 Valor (flumioxazin) Sprayer Contamination Photos: R. Joyce
  11. Tattnall Co. - 2023 Stine 9818-32N Possible linuron sprayer contamination Linex 4L @ 24 oz/A applied to V3-V4 (12”) tall field corn (P1197VYHR) caused a 22-32% yield reduction. Richburg et al. 2020. Weed Technology 34:277-283. 2.3 ppm of linuron was detected in tissue sample Photos: D. Bowen (May 2023)
  12. Mixing/Jug Errors
  13. Glyphosate/Peanut *6.8 ppm glyphosate Detected Jeff Davis Co. July 2023
  14. Jugs and Jugs?
  15. Jugs and Jugs? (~$1 million mistake)
  16. Herbicide Carryover Look-Alikes
  17. Pierce Co. - 2023 pH = 5.0; P was very high; K, Mg, Ca were all low
  18. Macon Co. - March 2023 Nematodes Root-knot = 100-140 100 is threshold Stubby = 170-200 40 is threshold Lesion = 50-210 200 or more is threshold K. Brown (GreenPoint AG)
  19. True Herbicide Carryover #5 for 57%
  20. Imazethapyr (Newpath) Carryover to Provisia or Conventional Rice Source: C. Webster – LSU (Oct 2023)
  21. Imazapic (Cadre) Carryover to Cotton
  22. Picloram (Grazon P+D) Carryover to Peanut
  23. Specialists with Same Rankings Li/Bradley Barber/Legleiter/Bond Prostko/Stephenson Cahoon/Baughman
  24. Generally, all of these problems are self-inflicted and could be minimized! Off-Target Movement nozzles, pressure, MPH, GPA, boom height, DRA’s, formulation, situational awareness Sprayer Contamination proper cleaning (label), hose type (rubber or polyethylene), separate sprayers Mixing/Jug Errors Non-labeled jugs, head in tank, color coded jugs/labels?, no assumptions Carryover Look-Alikes soil test, nematode test, grid-sampling is not absolute True Herbicide Carryover follow labeled crop rotation restrictions, local experts/experience, sprayer calibration, overlap
  25. Special Thanks to…… Alabama – Steve Li/David Russell Arkansas – Tom Barber/Tommy Butts Florida – Pratep Devkota Georgia – Stanley Culpepper Kentucky – Travis Legleiter Louisiana – Dan Stephenson/Connor Webster Missouri – Kevin Bradley Mississippi – Jason Bond North Carolina – Charlie Cahoon/Wes Everman Oklahoma – Todd Baughman South Carolina – Mike Marshall Tennessee – Larry Steckel Texas – Peter Dotray/Scott Nolte Virginia – Mike Flessner/Vijay Singh
  26. Questions/Comments eprostko@uga.edu www.gaweed.com 229-392-1034 (cell)