Peanut Response to Dicamba (Clarity) E.P. Prostko, T.L. Grey, M. - - PowerPoint PPT Presentation

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Peanut Response to Dicamba (Clarity) E.P. Prostko, T.L. Grey, M. - - PowerPoint PPT Presentation

Dec 15, 2023 325 likes •552 views

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 2007 Contaminated 2,4-DB Symptomology 2007 Contaminated 2,4-DB (> 250 ppm or 0.025%)

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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

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SLIDE 2

2007 Contaminated 2,4-DB Symptomology

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SLIDE 3

2007 Contaminated 2,4-DB (> 250 ppm or 0.025%)

0.012 EL-31 0.006 CE-04 0.010 EL-31 0.011 EL-31 0.104 0.198 EC-16 0.110 0.079 (MCPA) 0.170 EC-16 0.294 0.091 (MCPA) FB-01 2,4-D (%) Dicamba (%) Lot #

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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

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SLIDE 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)

Photo: Purdue University Weed Science

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Objectives

  • Determine the influence
  • f Clarity rate and

timing of application on peanut yield

  • Develop a predictive

model for future use

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SLIDE 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
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Site Descriptions

14 16 70 1.0 November 5 November 3 June 16 Tamrun OL02 Yoakum TX2 19 14 67 0.40 November 5 October 27 April 30 Flavor Runner 458 Lamesa TX1 October 15 October 8 May 19 Champs Blackville SC1 October 14 October 8 May 20 VA-98R Rocky Mount NC1 34 25 40 1.0 October 7 October 3 May 13 Georgia-02C Plains GA2 4 2 94 1.07 September 29 September 26 May 12 AP-3 Ty Ty GA1 15 16 69 2.1 September 18 September 19 May 12 Florida-07 Jay FL2 2 1 97 0.5 August 28 August 25 April 23 Georgia Green Citra FL1 Clay (%) Silt (%) Sand (%) OM (%) Soil Characteristics Harvest Date Digging Date Planting Date Variety Location State

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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

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SLIDE 10

Figure 1. Peanut Yield Response to Clarity, Ty Ty, GA (2008).

5037 4481 3777 3523 1622 664 4898 3841 3780 2469 1714 955 5047 4891 4800 4136 3509 2198

1000 2000 3000 4000 5000 6000 NTC 1 2 4 8 16 Clarity Rate/A (oz) lbs/A . 30 DAP 60 DAP 90 DAP

LSD 0.10 = 472

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Figure 2. Peanut Yield Response to Clarity, Lamesa, TX (2008).

6555 6079 5820 5282 4634 2651 6239 5327 4795 4136 2944 1939 6292 6281 5823 5380 4744 4294

1000 2000 3000 4000 5000 6000 7000 NTC 1 2 4 8 16 Clarity Rate/A (oz) lbs/A . 30 DAP 60 DAP 90 DAP

LSD 0.10 = 620

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Figure 3. Peanut Yield Response to Clarity, Yoakum, TX (2008).

3098 2365 2199 774 454 505 3153 2676 2551 1729 761 512 2980 2238 2233 1977 910 476

500 1000 1500 2000 2500 3000 3500 NTC 1 2 4 8 16 Clarity Rate/A (oz) lbs/A . 30 DAP 60 DAP 90 DAP

LSD 0.10 = 210

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Figure 4. Peanut Yield Response to Clarity, Rocky Mount, NC (2008).

3540 3020 2919 2241 649 303 3550 3000 2570 1805 1016 351 3894 3528 3550 3420 3325 3136

500 1000 1500 2000 2500 3000 3500 4000 4500 NTC 1 2 4 8 16 Clarity Rate/A (oz) lbs/A . 30 DAP 60 DAP 90 DAP

LSD 0.10 = 466

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Figure 5. Peanut Yield Response to Clarity, Blackville, SC (2008).

7420 6557 5798 6394 3906 1608 7964 6654 5256 3551 3316 1456 6319 7620 6336 6230 4858 2485

2000 4000 6000 8000 NTC 1 2 4 8 16 Clarity Rate/A (oz) lbs/A . 30 DAP 60 DAP 90 DAP

LSD 0.10 = 1208

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Figure 6. Peanut Yield Response to Clarity Rate (2008). (pooled over 3 timings)

4764 2510 4310 4044 2345 4083 4352 2038 4030 3931 1972 3636 3381 1325 3427 3247 1060 2567

1000 2000 3000 4000 5000 6000 Plains Jay Citra Location lbs/A . NTC 1 oz 2 oz 4 oz 8 oz 16 oz

Plains LSD 0.10 = 467 Jay LSD 0.10 = 599 Citra LSD 0.10 = 330

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Figure 7. Peanut Yield As Influenced by Clarity Timing (2008). (pooled over 6 rates)

3750 1394 3606 3874 1945 3569 4236 2286 3851

1000 2000 3000 4000 5000 Plains Jay Citra Tim ing (DA P) lbs/A > 30 DA P 60 D A P 90 DA P

Plains LSD 0.10 = 349 Jay LSD 0.10 = 422 Citra LSD 0.10 = 203

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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)

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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)

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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)

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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

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For More Weed Science Info www.gaweed.com

www.gaweed.com