Slide Presentation

TITLE    (click title to view slides)
Common Mistakes That Reduce Peanut Profitability - Weed Management

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

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TABLE OF CONTENTS
  1. Common Mistakes That Reduce Peanut Profitability - Weed Management
  2. Topics for Discussion
  3. Not a good way to start out!
  4. Starting Clean!!!!!
  5. Large (5"-23”" tall) Palmer Amaranth Control with Gramoxone 2SL @ 2.5 pt/A.
  6. Cobra 2EC @ 12.5 ozs/A + COC @ 1% v/v applied to 17" tall pigweed
  7. Estimated Yield Loss From Delayed Weed Removal in Peanut*
  8. Mixing/Loading/Sprayer Clean-Out
  9. Glyphosate Mishaps Again in 2019
  10. Glyphosate Mishaps Again in 2019
  11. Glyphosate Mishaps Again in 2019
  12. Peanut Yield Loss Caused By Glyphosate Applied 75-105 DAP in Georgia.
  13. Is this glyphosate? No, it’s diuron!
  14. Diuron 4L Applied 93 DAP
  15. Peanut (GA-06G) Yield Loss (%) From Diuron 4L
  16. Equipment Problems
  17. Sprayer/Nozzle Problems
  18. What’s Your Pesticide IQ?
  19. Treatments applied 6 DAC; Photo at 3 DAT
  20. Peanut Yield (GA-16HO) As Influenced by Gramoxone Timing (Averaged over 9 Gramoxone treatments)
  21. Grazon P+D Injury
  22. Peanut Yield Loss Caused by Grazon P+D 2.54SL in Georgia, 2015-2017.
  23. Final Thoughts
  24. Questions/Comments



SLIDE CONTENTS
  1. Common Mistakes That Reduce Peanut Profitability - Weed Management Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences
  2. Topics for Discussion failure to start clean weed size mixing/loading/ cleaning equipment issues Pesticide IQ labels crop rotations
  3. Not a good way to start out!
  4. Starting Clean!!!!! 4-5’ tall AMAPA Mowed Disked Rototilled 2X Photo taken 17 Days later ~$21A in extra tillage and still had problems!
  5. Large (5”-23” tall) Palmer Amaranth Control with Gramoxone 2SL @ 2.5 pt/A. 6 hours 4 days 7 days 19 days
  6. Cobra 2EC @ 12.5 ozs/A + COC @ 1% v/v applied to 17” tall pigweed 1 DAT 4 DAT 7 DAT 16 DAT
  7. Estimated Yield Loss From Delayed Weed Removal in Peanut* *Adapted from Everman et al. 2008. Weed Technology 22:63-67 5% of 5000 lbs/A = 250 lbs/A 250 lbs/A @ $0.205 = $51.25/A Mistake
  8. Mixing/Loading/Sprayer Clean-Out
  9. Glyphosate Mishaps Again in 2019 June 25 JK
  10. Glyphosate Mishaps Again in 2019 June 28 BS
  11. Glyphosate Mishaps Again in 2019 June 25 RB
  12. Peanut Yield Loss Caused By Glyphosate Applied 75-105 DAP in Georgia. Glyphosate Rate (5.5 lb ai/gal) – oz/A Yield Loss (%) 2 4 oz/A = 8.6% yield loss 8.6% of 5000 lbs/A = 430 lbs/A 430 lbs @ $0.205/lb = $88/A mistake
  13. Is this glyphosate? No, it’s diuron! 5900+ lbs/A Planting Date: April 20 Sprayed: June 7 Picture: June 20 Tift Co. 2018
  14. Diuron 4L Applied 93 DAP PE-02-19 August 14 106 DAP 13 DAT NTC 4 oz/A 8 oz/A 16 oz/A
  15. Peanut (GA-06G) Yield Loss (%) From Diuron 4L Time of Application (DAP) LSD (0.10) = 9 PE-02-19 4 oz/A @ 57 DAP = 18% yield loss 18% of 5000 = 900 lbs/A 900 lbs @ $0.205/lb = $185/A mistake
  16. Equipment Problems
  17. Sprayer/Nozzle Problems 2,4-DB (14 DAP) then Gramoxone + Storm (21 DAP) then Gramoxone + Storm (28 DAP) then Cadre + Dual Magnum + 2,4-DB (42 DAP) ~$51/A mistake (4 applications + product) – not counting any yield loss from rate/timing
  18. What’s Your Pesticide IQ? How well do you know your products? When was the last time you really read the label? Label Bending?
  19. Treatments applied 6 DAC; Photo at 3 DAT GA-02C GI @ 8 oz/A + NIS @ 0.25% v/v GI @ 12 oz/A + Basagran @ 8 oz/A + NIS @ 0.25% v/v
  20. Peanut Yield (GA-16HO) As Influenced by Gramoxone Timing (Averaged over 9 Gramoxone treatments) PE-07-18 weed-free irrigated THSD (0.10) = 246 CV = 6.5 5.5% yield loss 5.5% of 5000 lbs/A = 275 lbs/A 275 lbs/A @ $0.205/lb = $56/A mistake
  21. Grazon P+D Injury
  22. % of Labeled Rate (24 oz/A) Yield Loss (%) 2.4 oz/A = 11.3% yield loss 11.3% of 5000 lbs/A = 565 lbs/A 565 lbs @ $0.205/lb = $116/A mistake
  23. Final Thoughts Avoid self-inflicted problems! STOP-DROP-ROLL Rate X time of application (read label) Sprayer clean-out Pesticide containers Rotation restrictions Don’t wait until “all the weeds” have come up
  24. Questions/Comments