New Peanut Cultivar Response to Paraquat Applications

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Presentation transcript:

New Peanut Cultivar Response to Paraquat Applications Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Department of Crop & Soil Sciences

Paraquat in Peanut Labeled in 1988 Replacement for dinoseb significant foliar injury Cultivars changing all the time

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

Acreage Planted in Seed Certification Program in SE in 2013 to Produce 2014 Seed Supply

Materials and Methods - I Tests 1 and 2 GA-06B, GA-09B 3 timings (15, 22, 31 DAP) Gramoxone, Gramoxone + Storm, Gramoxone + Storm + Dual Magnum Tifton Tests 3 and 4 GA-06G Tifton, Attapulgus Gramoxone, Storm, Dual Magnum, Cadre Small-plots 4 replications weed-free irrigated

Materials and Methods - II Stages of Growth Tests 1 & 2 Cultivar 15 DAP 22 DAP 31 DAP GA-06G V4 3 in V6 4 in V7 GA-09B Tests 3 & 4 Location EPOST POST Tifton 13 DAP V3 2 in 35 DAP R1 4 in Attapulgus 18 DAP V5 3 in 39 DAP 9 in R1 Beginning bloom

Results

Peanut Cultivar Response to Gramoxone Application Timings - 2013 (DAP) Yield (lb/A) GA-06G GA-09B 15 6183 5818 22 6452 5856 31 6206 5723 P-value 0.4216 0.8705 Averaged over 4 herbicide treatments. UGA Ponder Farm (Tifton) Tests 1 & 2 PE-02-13 PE-02B-13

Peanut Cultivar Response to Gramoxone Treatments - 2013 Herbicide Rate/A Yield (lb/A) GA-06G GA-09B None -- 6291 5701 Gramoxone 2SL Adept 8 oz 0.25% v/v 6218 5720 Storm 4SL 12 oz 16 oz 6328 5813 Dual Magnum 7.62EC 6284 5962 P-value 0.9310 0.8837 Averaged over 3 application timings (15, 22, and 31 DAP). UGA Ponder Farm (Tifton) Tests 1& 2 PE-02-13 PE-02B-13

GA-06 Response to Gramoxone Treatments - 2013 Herbicide Rate/A Timing Yield (lb/A) Tifton Attapulgus None -- 6857 7306 Gramoxone 2SL Storm 4SL Dual Magnum 7.62EC 12 oz 16 oz EPOST 6906 6962 Cadre 2AS 4 oz POST 6754 7525 6617 7124 P-value 0.7934 0.8831 Tests 3 & 4 PE-12-13 PE-13-13

Is there a better way to evaluate yield response? Frequently herbicide tolerance trials are NS Large LSD values?

A Comparison of Irrigated Weed-Free Peanut Yields Between NTC and Gramoxone (12 oz/A) + Storm (16 oz/A) + Dual Magnum (16-21 oz/A) Treatments in Georgia, 2011-2013. G + S + DM (lbs/A) PEA01-11 (GA-06G) PEA01-12 (GA-06G) PE-20-11 (GA-06G) PE-01-12 (GA-06G) PE-17-12 (GA-06G) PE-02-13 (GA-06G) PE-02B-13 (GA-09B) PE-12-13 (GA-06G) PE-13-13 (GA-06G) 6000 = 5801 (97%) 7000 = 6590 (94%) NTC (lbs/A) n = 50

NTC Peanut Yield Variability (lb/A)

Summary/Conclusions Leaf burn and crop stunting were observed Peanut yields were not reduced by any herbicide treatment New cultivars (GA-06G, GA-09B) are tolerant to common paraquat treatments. Dryland vs. Irrigated????

Questions? eprostko@uga.edu www.ugaweed.com