1. Peanut Weed Control Update - 2011 (County Extension Agents) Eric P. Prostko Professor and Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia

2. Topics for Discussion Cadre Carryover Palmer Control Classic Update Gramoxone Update Changes in 2012 Pest Control Rec’s Charge New Stuff New Publication Future Concerns

4. Cotton/Cadre Carryover Problems Worse in 2011? **18.59” deficit rainfall

5. What about 2012? Rainfall (in): June 1 – Nov 30 Tifton Campus Conference Center Month in

6. Cotton/Cadre Carryover Problems Worse in 2011? **9.76” deficit rainfall

7. What about 2012? Rainfall (in): June 1 – Nov 30 Statesboro Month in

8. Cadre/Impose Rotational Restrictions

9. If growers cannot or will not use Cadre…... weed control costs will probably be higher purple nutsedge will not be controlled Dual Magnum ($10-14/A) but not as effective. Generic metolachlors are cheaper but may not last as long ($5-6/A). Strongarm + Valor Other POST herbicides (Basagran, Blazer, Cobra, Storm) are effective but have some weaknesses and no residual

10. “Cadre-Free” Weed Control Programs Program 1 –Prowl or Sonalan – PPI/PRE –Valor (3 oz/A) + Strongarm (0.23 oz/A) – PRE –Cobra or Ultra Blazer + Dual Magnum – POST Program 2 –Prowl or Sonalan – PPI/PRE –Gramoxone + Storm + Dual Magnum – EPOST –Cobra or Ultra Blazer + Dual Magnum – POST 2,4-DB as needed in both programs for sicklepod. Will likely need 2 applications.

11. What one man can do, so can another! Sumter County - June 28, 2011 (Prowl + Valor fb Cadre)

12. Pigweed Control is not impossible!!!! Common Reasons for Failure: 1) did not start clean 2) did not use a residual 3) residual did not get activated 4) POST applications are too late 5) short arms and deep pockets

13. Palmer Amaranth Control in Peanut Valor Program PE-26-11 August 25 108 DAP NTC Prowl H 2 0 3.8SC @ 32 oz/A (PRE) Valor 51WG @ 3 oz/A (PRE) Cadre 2AS @ 4 oz/A (POST) COC @ 1% v/v (POST)

14. Palmer Amaranth Control in Peanut Dual (metolachlor) Program Prowl H 2 0 @ 34 oz/A (2 DAP) Gramoxone Inteon @ 12 oz/A (21 DAP) Storm @ 16 oz/A (21 DAP) Dual Magnum @ 16 oz/A (21 DAP) Cadre @ 4 oz/A (37 DAP) Dual Magnum @ 16 oz/A (37 DAP) PE16B-11 Sept 2 116 DAP NTC

15. FL-07, GA Greener = No problems GA-06G and Tifguard = 7-11% yield losses

16. Peanut Yield Response (lbs/A) to Classic @ 0.5 oz/A (2008-2011) Time of Application (DAE b ) Cultivar a Florida-07 c Georgia-06GTifguard NTC6321 a5736 a5700 a 60-696251 a5130 c5313 ab 70-796150 a5310 bc5200 b 90-996395 a5263 bc5101 b 100+6378 a5627 ab5097 b a Means are averaged over 2 site-years. b DAE = days after peanut emergence. c Means in the same column with the same letter are not significantly different according to Fisher’s Protected LSD Test (P = 0.10). **When significant, yield losses ranged between 7 to 11%

17. Georgia Greener Yield Response to Classic (0.5 oz/A): 2011-2012 Time of Application (DAE)20112012 06187 60-695195 70-795632 90-995591 100+5773 LSD 0.10 CV NS 13 DAE = Days After Peanut Emergence

18. A New Formulation of Paraquat from Syngenta

19. 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

20. The influence of paraquat on peanut yield (lbs/A) 1. Herbicide 2 Rate/ A GA-06GFL-07Tifguard 200820092009201020102011 None--521057415932573756773215 Gramoxone Inteon 2SL + NIS 8 oz + 0.25% v/v 50695311 (-7.5%) 5737 (-3.3%) 545353882995 Gramoxone Inteon 2SL + Basagran 4SC + NIS 12 oz + 8 oz + 0.25% v/v 508256535843554556463196 LSD (0.10)NS265110NS 1 Weed-free conditions. 2 Pooled over four application timings (7, 14, 21, and 28 DAC)

21. 2012 Peanut Pest Control Rec Changes

22. Spartan Charge 3.5L FMC Sulfentrazone (Spartan) @ 3.15 lb/gal + carfentrazone (Aim) @ 0.35 lb/gal PRE @ 3-4 oz/A Tank-mix with Prowl or Dual Not on sands with less than 1% OM Rotation Restrictions: canola = 24 months; field corn = 4 months; cotton = 12 months**; small grains = 4 months; sorghum = 10 months; soybeans = anytime; sunflowers = anytime; tobacco = anytime. Same MOA as Valor (PPO) ** some UGA research suggests that the crop rotation restriction for cotton should be 18 months.

23. Palmer Amaranth Control in Peanut Valor vs. Spartan Charge PE-26-11 August 25 108 DAP NTC Prowl H 2 0 3.8SC @ 32 oz/A (PRE) Valor 51WG @ 3 oz/A (PRE) Cadre 2AS @ 4 oz/A (POST) COC @ 1% v/v (POST) Prowl H 2 0 3.8SC @ 32 oz/A (PRE) Spartan Charge 3.5L @ 4 oz/A (PRE) Cadre 2AS @ 4 oz/A (POST) COC @ 1% v/v (POST)

24. Sulfentrazone Injury on Peanut High rates, lighter soils

25. Potential New Herbicides? Valor + Pyroxasulfone Pyroxasulfone Micro-encapsulated acetochlor

26. Weed Control in Peanut with Warrant Systems PE-21-11 July 19 64 DAP NTC Prowl H 2 0 @ 34 oz/A (2 DAP) Gramoxone Inteon @ 12 oz/A (21 DAP) Storm @ 16 oz/A (21 DAP) Warrant @ 48 oz/A (21 DAP) Cadre @ 4 oz/A (37 DAP) Warrant @ 48 oz/A (37 DAP) Prowl H 2 0 @ 34 oz/A (2 DAP) Gramoxone Inteon @ 12 oz/A (21 DAP) Storm @ 16 oz/A (21 DAP) Dual Magnum @ 16 oz/A (21 DAP) Cadre @ 4 oz/A (37 DAP) Dual Magnum @ 16 oz/A (37 DAP)

27. Palmer Amaranth Control in Peanut with Fierce PE-24-11 July 29 81 DAP NTC Fierce 76WG @ 3 oz/A (PRE)

28. Weed Control in Peanut with Pyroxasulfone PE-16B-11 July 19 64 DAP NTC Pyroxasulfone 85WG @ 1.5 oz/A (2 DAP) Strongarm @ 0.23 oz/A (2 DAP) Valor @ 3 oz/A (2 DAP) Cadre @ 4 oz/A (37 DAP) 80/20 @ 0.25% v/v (37 DAP)

29. New Publication “Peanut Response to Glyphosate” UGA Circular 1007 September 2011 http://www.caes.uga.edu/applications/publications/files/pdf/C%201007_1.PDF

30. Future Concerns/Issues Abuse of Ignite Increased use of Dual Magnum and Warrant Increased use of PPO herbicides –Valor and Reflex

31. Thanks for Listening! eprostko@uga.edu 229-392-1034 (cell) www.gaweed.com Eric P. Prostko (office) Eric Prostko - laptop