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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
Common Mistakes That Reduce Peanut Profitability - Weed Management
Topics for Discussion
Not a good way to start out!
Starting Clean!!!!!
Large (5"-23”" tall) Palmer Amaranth Control with Gramoxone 2SL @ 2.5 pt/A.
Cobra 2EC @ 12.5 ozs/A + COC @ 1% v/v applied to 17" tall pigweed
Estimated Yield Loss From Delayed Weed Removal in Peanut*
Mixing/Loading/Sprayer Clean-Out
Glyphosate Mishaps Again in 2019
Glyphosate Mishaps Again in 2019
Glyphosate Mishaps Again in 2019
Peanut Yield Loss Caused By Glyphosate Applied 75-105 DAP in Georgia.
Is this glyphosate? No, it’s diuron!
Diuron 4L Applied 93 DAP
Peanut (GA-06G) Yield Loss (%) From Diuron 4L
Equipment Problems
Sprayer/Nozzle Problems
What’s Your Pesticide IQ?
Treatments applied 6 DAC; Photo at 3 DAT
Peanut Yield (GA-16HO) As Influenced by Gramoxone Timing (Averaged over 9 Gramoxone treatments)
Grazon P+D Injury
Peanut Yield Loss Caused by Grazon P+D 2.54SL in Georgia, 2015-2017.
Final Thoughts
Questions/Comments
SLIDE CONTENTS
Common Mistakes That Reduce Peanut Profitability - Weed Management Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences
Topics for Discussion failure to start clean weed size mixing/loading/ cleaning equipment issues Pesticide IQ labels crop rotations
Not a good way to start out!
Starting Clean!!!!! 4-5’ tall AMAPA Mowed Disked Rototilled 2X Photo taken 17 Days later ~$21A in extra tillage and still had problems!
Large (5”-23” tall) Palmer Amaranth Control with Gramoxone 2SL @ 2.5 pt/A. 6 hours 4 days 7 days 19 days
Cobra 2EC @ 12.5 ozs/A + COC @ 1% v/v applied to 17” tall pigweed 1 DAT 4 DAT 7 DAT 16 DAT
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
Mixing/Loading/Sprayer Clean-Out
Glyphosate Mishaps Again in 2019 June 25 JK
Glyphosate Mishaps Again in 2019 June 28 BS
Glyphosate Mishaps Again in 2019 June 25 RB
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
Is this glyphosate? No, it’s diuron! 5900+ lbs/A Planting Date: April 20 Sprayed: June 7 Picture: June 20 Tift Co. 2018
Diuron 4L Applied 93 DAP PE-02-19 August 14 106 DAP 13 DAT NTC 4 oz/A 8 oz/A 16 oz/A
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
Equipment Problems
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
What’s Your Pesticide IQ? How well do you know your products? When was the last time you really read the label? Label Bending?
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
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
Grazon P+D Injury
% 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
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
Questions/Comments