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R.M. Merchant*, E.P. Prostko, P.M. Eure,
and T.M. Webster

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TABLE OF CONTENTS
  1. Peanut Response to Simulated Drift Rates of 2,4-D
  2. Introduction - I
  3. Introduction - II
  4. Introduction - III
  5. Introduction - IV
  6. 2,4-D symptomology of peanut - 30 DAP
  7. Objective
  8. Materials and Methods - I
  9. Materials and Methods - II
  10. Materials and Methods - III Peanut Growth Stages
  11. Reproductive Growth Stages of Peanut
  12. Statistical Analysis
  13. Results and Discussion
  14. Yield Response - 30 DAP
  15. 1 week after treatment
  16. Yield Response - 60 DAP
  17. 1 week after treatment
  18. Yield Response - 90 DAP
  19. 1 week after treatment
  20. Summary
  21. Summary
  22. Conclusions
  23. Future Research
  24. Questions?



SLIDE CONTENTS
  1. R.M. Merchant*, E.P. Prostko, P.M. Eure, and T.M. Webster Peanut Response to Simulated Drift Rates of 2,4-D
  2. Introduction - I In Georgia, peanuts were planted on nearly 202,000 ha in 2012
  3. Introduction - II Cotton and Soybeans are grown in close proximity to peanuts in Georgia
  4. Introduction - III Damage to peanut from commonly used cotton and soybean herbicides does occur Glyphosate and glufosinate occur most often Previous research has quantified the effects of these herbicides (Prostko et al. ) glyphosate glufosinate
  5. Introduction - IV New technologies allow for POST topical application of 2,4-D or dicamba in cotton and soybean Confusion of 2,4-D with 2,4-DB has consequences
  6. 2,4-D symptomology of peanut – 30 DAP
  7. Objective To determine peanut yield response to simulated drift and tank contamination rates of 2,4-D amine
  8. Materials and Methods - I 2 Field Trials UGA Ponder Research Farm (Worth Co.) Attapulgus Research/Extension Center (Decatur Co.) ‘GA-06G’ Split-plot, 4 replications Whole Plot 30, 60, 90 DAP Sub-plot 2,4-D amine rate Weedar 64 Amine (3.8 lbs/gal) 105, 210, 420, 840, 1680 g ai/ha
  9. Materials and Methods - II CO2-pressurized backpack sprayer 140 L/ha Visual estimates of crop injury 0 -100% Yield 100 pod/seed weights
  10. Materials and Methods – III Peanut Growth Stages
  11. Reproductive Growth Stages of Peanut Growth stages of peanut K. J. Boote, Peanut Science 9:35-40 Beginning pod Beginning peg R2 R3 R1 Beginning bloom R4 R7 R5 R6 Beginning seed Beginning maturity Full pod Full seed
  12. Data combined over locations and subjected to ANOVA Significant interaction between treatment and yield at 30 and 60 DAP Regression analysis using Sigma Plot 11 Statistical Analysis
  13. Results and Discussion
  14. Yield Response – 30 DAP y= 699760 1+e-(x-169/13.8) r2= 0.57 p= <0.0001 105 420 1680 Rate ( g ai/ha)
  15. 105 g ai/ha 1680 g ai/ha 1 week after treatment
  16. Yield Response – 60 DAP y= 9.86 + 0.82x r2= 0.26 p= 0.003 105 420 1680 Rate ( g ai/ha)
  17. 105 g ai/ha 1680 g ai/ha 1 week after treatment
  18. Yield Response – 90 DAP 105 420 1680 Rate ( g ai/ha)
  19. 105 g ai/ha 1680 g ai/ha 1 week after treatment
  20. Summary 105 420 1680 Rate ( g ai/ha)
  21. Summary Yield loss increased as rate increased when 2,4-D was applied 30 DAP and 60 DAP There was no significant loss of yield when 2,4-D was applied 90 DAP at any rate
  22. Conclusions 2,4-D was most injurious when applied at 60 DAP There was no negative effect at 90 DAP Growers must be cautious when applying 2,4-D
  23. Future Research Currently repeating tests at 2 locations in 2012 Earlier times of application 10, 20 DAP Continue to screen current and future herbicides for off-target/contamination damage to peanut
  24. Questions?