Slide Presentation

TITLE    (click title to view slides)

AUTHOR
E.P. Prostko, T.L. Grey, M. Marshall, J.A. Ferrell, D.L. Jordan, B.J. Brecke, P.A. Dotray, W.J.Grichar

DOWNLOAD PRESENTATION    (right click and select 'Save Target As...')

TABLE OF CONTENTS
  1. Peanut Response to Dicamba (Clarity)
  2. 2007 Contaminated 2,4-DB Symptomology
  3. 2007 Contaminated 2,4-DB
  4. Dicamba-Resistant Crops
  5. Dicamba Drift on Soybeans
  6. Objectives
  7. Materials and Methods
  8. Site Descriptions
  9. Results
  10. Figure 1. Peanut Yield Response to Clarity, Ty Ty, GA (2008).
  11. Figure 2. Peanut Yield Response to Clarity, Lamesa, TX (2008).
  12. Figure 3. Peanut Yield Response to Clarity, Yoakum, TX (2008).
  13. Figure 4. Peanut Yield Response to Clarity, Rocky Mount, NC (2008).
  14. Figure 5. Peanut Yield Response to Clarity, Blackville, SC (2008).
  15. Figure 6. Peanut Yield Response to Clarity Rate (2008). (pooled over 3 timings)
  16. Figure 7. Peanut Yield As Influenced by Clarity Timing (2008). (pooled over 6 rates)
  17. Peanut Response to Clarity (dicamba) 4SC @ 16 ozs/A
  18. Peanut Response to Clarity (dicamba) 4SC @ 8 ozs/A
  19. Peanut Response to Clarity (dicamba) 4SC @ 1 oz/A
  20. Summary
  21. For More Weed Science Info www.gaweed.com



SLIDE CONTENTS
  1. Peanut Response to Dicamba (Clarity) E.P. Prostko, T.L. Grey, M. Marshall, J.A. Ferrell, D.L. Jordan, B.J. Brecke, P.A. Dotray, W.J. Grichar APRES 2009
  2. 2007 Contaminated 2,4-DB Symptomology
  3. 2007 Contaminated 2,4-DB (> 250 ppm or 0.025%)
  4. Dicamba-Resistant Crops Behrens et al. 2007 Science 316:1185-1188. (Nebraska) Transferred gene from Pseudomonas maltophila into tobacco, soybeans, tomatoes Monsanto in hot pursuit dicamba acid dicamba DGA salt
  5. Dicamba Drift on Soybeans 14-93% yield reduction (V3) Anderson et al. 2004 (SD) 15%-22% yield loss (V3); 12-28% yield loss (V7) Kelley et al. 2005 (IL)
  6. Objectives Determine the influence of Clarity rate and timing of application on peanut yield Develop a predictive model for future use
  7. Materials and Methods 8 locations across Peanut Belt GA(2), FL(2), SC(1), NC(1), TX (2), RCB design 3 X 6 factorial arrangement Timing (30, 60, 90 DAP) Rate (0, 1, 2, 4, 8, 16 oz/A Clarity) 4 replications Weed-free
  8. Site Descriptions
  9. Results 5 locations had significant rate X timing interaction Lamesa, Yoakum, Rocky Mount, Blackville, and TyTy 3 locations had no interaction Plains, Jay, Citra Rate and timing were significant
  10. Figure 1. Peanut Yield Response to Clarity, Ty Ty, GA (2008). LSD 0.10 = 472
  11. Figure 2. Peanut Yield Response to Clarity, Lamesa, TX (2008). LSD 0.10 = 620
  12. Figure 3. Peanut Yield Response to Clarity, Yoakum, TX (2008). LSD 0.10 = 210
  13. Figure 4. Peanut Yield Response to Clarity, Rocky Mount, NC (2008). LSD 0.10 = 466
  14. Figure 5. Peanut Yield Response to Clarity, Blackville, SC (2008). LSD 0.10 = 1208
  15. Figure 6. Peanut Yield Response to Clarity Rate (2008). (pooled over 3 timings) Plains LSD 0.10 = 467 Jay LSD 0.10 = 599 Citra LSD 0.10 = 330
  16. Figure 7. Peanut Yield As Influenced by Clarity Timing (2008). (pooled over 6 rates) Plains LSD 0.10 = 349 Jay LSD 0.10 = 422 Citra LSD 0.10 = 203
  17. Peanut Response to Clarity (dicamba) 4SC @ 16 ozs/A Applied 30 DAP (664 lb/A 87% loss) Applied 60 DAP (955 lb/A 81% loss) Applied 90 DAP (2198 lb/A 56% loss) Photo 107 DAP Ty Ty, GA NTC (4994 lb/A)
  18. Peanut Response to Clarity (dicamba) 4SC @ 8 ozs/A Applied 30 DAP (1622 lb/A 67% loss) Applied 60 DAP (1714 lb/A 66% loss) Applied 90 DAP (3509 lb/A 30% loss) Photo 107 DAP Ty Ty, GA NTC (4994 lb/A)
  19. Peanut Response to Clarity (dicamba) 4SC @ 1 oz/A Applied 30 DAP (4481 lb/A 10% loss) Applied 60 DAP (3841 lb/A 33% loss) Applied 90 DAP (4891 lb/A 2% loss) Photo 107 DAP Ty Ty, GA NTC (4994 lb/A)
  20. Summary Increase Clarity rate = increase peanut yield loss Increase peanut age = decreased peanut yield loss Some locations (13/25) 60 DAP more sensitive (R3-R4 stage of growth) Can get significant peanut yield reductions with as little as 1 oz/A Clarity 13% average (0%-low, 25%-high) Growers need to avoid contamination/drift problems
  21. For More Weed Science Info www.gaweed.com www.gaweed.com