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

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TABLE OF CONTENTS
  1. Peanut Response to Engenia and Enlist Duo
  2. Georgia Planted Acres - 2017
  3. 2016 Cotton - Southeast
  4. Peanuts/2,4-D/Dicamba
  5. Previous Research
  6. Objectives
  7. Materials and Methods
  8. Peanut Stages of Growth
  9. Data Collection/Analysis
  10. Results
  11. Engenia (dicamba) Injury Symptoms
  12. Peanut (GA-06G) Response to Engenia 5SL (dicamba) Applied at Various Times @ 12.8 oz/A
  13. Peanut (GA-06G) Response to Engenia 5SL (dicamba) Applied at Various Times @ 1.28 oz/A
  14. Peanut (GA-06G) Response to Engenia 5SL (dicamba) Applied at Various Times @ 0.128 oz/A
  15. Peanut (GA-06G) Yield Losses (%) Caused by Engenia 5SL - 2016
  16. Enlist Duo Injury Symptoms
  17. Peanut (GA-12Y) Response to Enlist Duo 3.3SL (glyphosate + 2,4-D choline) Applied at Various Times @ 56 oz/A
  18. Peanut (GA-12Y) Response to Enlist Duo 3.3SL (glyphosate + 2,4-D choline) Applied at Various Times @ 5.6 oz/A
  19. Peanut (GA-12Y) Response to Enlist Duo 3.3SL (glyphosate + 2,4-D choline) Applied at Various Times @ 0.56 oz/A
  20. Peanut (GA-12Y) Yield Losses (%) Caused by Enlist Duo 3.3SL - 2016
  21. Peanut Yield Loss Caused By Simulated Drift Rates (1X) - 2016
  22. Peanut Yield Loss Caused By Simulated Drift Rates (1/10X) - 2016
  23. Peanut Yield Loss Caused By Simulated Drift Rates (1/100X) - 2016
  24. Summary - I
  25. Summary - II
  26. Future Research
  27. Questions?



SLIDE CONTENTS
  1. Peanut Response to Engenia™ and Enlist™ Duo E.P. Prostko1 and O.W. Carter2 1Professor/Extension Weed Specialist 2Graduate Research Assistant Dept. Crop & Soil Sciences
  2. Georgia Planted Acres - 2017 NASS June 30, 2017
  3. 2016 Cotton - Southeast ~43% of SE cotton acreage was planted to Xtend varieties 46.2% of GA cotton acres DP1538B2XF (21.28%) DP1553B2XF (17.09%) DP1646B2XF (7.79%) 2017 (GA) – July 11 Xtend (>75%) Dr. J. Whitaker - UGA Enlist (1.9% or 25,000 A) Dr. J. Richburg - DAS
  4. Peanuts/2,4-D/Dicamba How much? Vapor Drift 1/1000thX? Particle Drift 1/10thX to 1/100thX Tank-contamination (heel) 1/50thX to 1/400thX When? Stage of growth
  5. Previous Research
  6. Objectives Effects of lower rates of Engenia™ (1/100thX) dicamba-BAPMA Effects of Enlist™ Duo glyphosate + 2,4-D choline
  7. Materials and Methods UGA Ponder Research Farm – 2016 Engenia™ Test ‘GA-06G’ 1X, 1/10X, 100X 15, 30, 60, 90 DAP Enlist™ Duo Test ‘GA-12Y’ 1X, 1/10X, 1/100X 15, 30, 60, 90 DAP factorial design rate X timing 4 replications 15 GPA, 11002AIXR weed-free
  8. Peanut Stages of Growth
  9. Data Collection/Analysis Peanut Response stunting leaf burn leaf roll stand loss Yield ANOVA (P=0.10)
  10. Results
  11. Engenia (dicamba) Injury Symptoms
  12. Peanut (GA-06G) Response to Engenia 5SL (dicamba) Applied at Various Times @ 12.8 oz/A PE-04-16 August 12 107 DAP 15 DAP 30 DAP 60 DAP 90 DAP
  13. Peanut (GA-06G) Response to Engenia 5SL (dicamba) Applied at Various Times @ 1.28 oz/A PE-04-16 August 12 107 DAP 15 DAP 60 DAP 90 DAP 15 DAP 30 DAP 60 DAP 90 DAP
  14. Peanut (GA-06G) Response to Engenia 5SL (dicamba) Applied at Various Times @ 0.128 oz/A PE-04-16 August 12 107 DAP 15 DAP 30 DAP 60 DAP 90 DAP 15 DAP 30 DAP 60 DAP 90 DAP
  15. Peanut (GA-06G) Yield Losses (%) Caused by Engenia 5SL - 2016 1DAP = days after planting. PE-04-16 LSD 0.10 = 7 CV = 23
  16. Enlist Duo Injury Symptoms
  17. Peanut (GA-12Y) Response to Enlist Duo 3.3SL (glyphosate + 2,4-D choline) Applied at Various Times @ 56 oz/A PE-05-16 August 12 107 DAP
  18. Peanut (GA-12Y) Response to Enlist Duo 3.3SL (glyphosate + 2,4-D choline) Applied at Various Times @ 5.6 oz/A PE-05-16 August 12 107 DAP 15 DAP 30 DAP 60 DAP 90 DAP
  19. Peanut (GA-12Y) Response to Enlist Duo 3.3SL (glyphosate + 2,4-D choline) Applied at Various Times @ 0.56 oz/A PE-05-16 August 12 107 DAP 15 DAP 30 DAP 60 DAP 90 DAP
  20. Peanut (GA-12Y) Yield Losses (%) Caused by Enlist Duo 3.3SL - 2016 1DAP = days after planting. 256 oz/A = 0.7 lb ae 2,4-D + 0.74 lb ae glyphosate; 5.6 oz/A = 0.07 lb ae 2,4-D + 0.074 lb ae of glyphosate; 0.56 oz/A= 0.007 lb ae 2,4-D + 0.0074 lb ae glyphosate. PE-05-16 LSD 0.10 = 8 CV = 38
  21. Peanut Yield Loss Caused By Simulated Drift Rates (1X) - 2016 Engenia = 12.8 oz/A Enlist Duo = 56 oz/A
  22. Peanut Yield Loss Caused By Simulated Drift Rates (1/10X) - 2016 Engenia = 1.28 oz/A Enlist Duo = 5.6 oz/A
  23. Peanut Yield Loss Caused By Simulated Drift Rates (1/100X) - 2016 Engenia = 0.128 oz/A Enlist Duo = 0.56 oz/A
  24. Summary - I Timing X Rate interaction for both (yield loss) Engenia Within Time 1X > 0.1X > 0.01X (15, 30, 60 DAP) 1X > 0.1X = 0.01X (90 DAP) Within Rate 15 DAP = 30 DAP = 60 DAP > 90 DAP (1X and 0.1X) = 8% yield loss at any timing (0.01X)
  25. Summary - II Enlist Duo Within Time 1X > 0.1X = 0.01X (15, 30, 60, 90 DAP) Within Rate 15 DAP < 30 DAP = 60 DAP = 90 DAP (1X) 15 DAP = 30 DAP = 60 DAP; 30 DAP = 60 DAP = 90 DAP; 15 DAP > 90 DAP (0.1X) 15 DAP = 30 DAP = 60 DAP = 90 DAP (0.01X) = 12% yield loss at any timing (0.01X)
  26. Future Research repeated studies in 2016 glyphosate + dicamba glufosinate + dicamba or 2,4-D multiple events seed germination studies residue analysis hull and nut
  27. Questions? eprostko@uga.edu www.gaweed.com