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Peanut Weed Control Update - 2015

AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. Peanut Weed Control Update - 2015
  2. It Ain’t Always Herbicides
  3. A Herbicide Problem??
  4. Relationship between pH and zinc availability
  5. J-Rooting Peanuts - No Herbicides Applied
  6. Starting Clean
  7. Did you really start clean???? A disk may not be good enough!
  8. Peanut Weed Control Programs (2014) I - Valor + Strongarm + Prowl fb Cadre, Cobra, or Blazer
  9. Peanut Weed Control Programs (2014) II - Prowl fb Gramoxone fb Cadre, Cobra, or Blazer
  10. Peanut Weed Control Programs Without Valor - 2014
  11. Warrant Label Change (Hopefully?)
  12. Treatments applied 6 DAC; Photo at 3 DAT
  13. 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)
  14. A Comparison of Irrigated Weed-Free Peanut Yields Between NTC and Gramoxone (12 oz/A) + Storm (16 oz/A) + Dual Magnum (16 oz/A) fb Cadre (4 oz/A) + Dual Magnum (16 oz/A)
  15. My Opinion
  16. Cobra @ 12 .5 oz/A + Dual Magnum @ 16 oz/A + 2,4-DB @ 18 oz/A - 2 DAT
  17. Cobra + 2,4-DB + Dual or Warrant - 2014
  18. Cadre (CD), Cobra (CB), 2,4-DB, Dual Magnum (DM), and Warrant (W) Effects on Peanut Yield - I
  19. Cadre (CD), Cobra (CB), 2,4-DB, Dual Magnum (DM), and Warrant (W) Effects on Peanut Yield - II
  20. Tank-Mixtures The Impossible Dream
  21. The Tank-Mixes Blues!
  22. Select Max @ 16 oz/A + NIS @ 0.25% v/v fb Priaxor @ 6 oz/A + Boron @ 1 qt/A Applied 1 hour later
  23. Cadre + 2,4-DB + Dual Magnum + Priaxcor - 3 DAT
  24. Peanut (GA-12Y) Yield Response (lb/A) to Odd Tank-Mixtures - 2014
  25. Dual Magnum, Warrant, Zidua, Fungicide Tank-Mixes 2014
  26. Dual Magnum @ 21 oz/A + Tilt/Bravo @ 32 oz/A - 7 DAT
  27. Our Next Resistance Issue or Timing Issue????
  28. Sicklepod Survey
  29. 2014 Sicklepod Seed Survey
  30. Perennial Weeds in Peanut - I
  31. Perennial Weeds in Peanut - II
  32. New Labels 2016?
  33. Anthem Flexx Injury from POST Apps
  34. What do the top growers do? 2013 Georgia Peanut Achievement Club Winners
  35. Questions???



SLIDE CONTENTS
  1. Peanut Weed Control Update - 2015 Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Department of Crop & Soil Sciences
  2. It Ain’t Always Herbicides
  3. A Herbicide Problem??
  4. pH = 4.9 Zn = 46 lb/A
  5. J-Rooting Peanuts – No Herbicides Applied GA-06G, Planted May 5, 2014, Pictures May 20
  6. Starting Clean If you are getting ready to plant and get to the field and have pigweed > 6” tall ………… Park the planter and sprayer Go get your mower, disk, and/or bottom plow!!!!!!!!
  7. Did you really start clean???? A disk may not be good enough!
  8. Peanut Weed Control Programs (2014) – I Valor + Strongarm + Prowl fb Cadre, Cobra, or Blazer PE-02-14 June 26 52 DAP NTC Prowl H20 @ 34 oz/A - PRE Valor @ 3 oz/A – PRE Strongarm @ 0.23 oz/A – PRE Cadre @ 4 oz/A – POST (36 DAP) Dual Magnum @ 16 oz/A – POST ( 36 DAP) Prowl H20 @ 34 oz/A - PRE Valor @ 3 oz/A – PRE Strongarm @ 0.23 oz/A – PRE Cobra @ 12.5 oz/A – POST (36 DAP) Dual Magnum @ 16 oz/A – POST ( 36 DAP) 2,4-DB @ 18 oz/A – POST (36 DAP) Prowl H20 @ 34 oz/A - PRE Valor @ 3 oz/A – PRE Strongarm @ 0.23 oz/A – PRE Ultra Blazer @ 24 oz/A – POST (36 DAP) Dual Magnum @ 16 oz/A – POST ( 36 DAP) 2,4-DB @ 18 oz/A – POST (36 DAP)
  9. Peanut Weed Control Programs (2014) – II Prowl fb Gramoxone fb Cadre, Cobra, or Blazer PE-02-14 June 26 52 DAP NTC Prowl H20 @ 34 oz/A – PRE Gramoxone @ 12 oz/A – EPOST (22 DAP) Storm @ 16 oz/A – EPOST (22 DAP) Dual Magnum @ 16 oz/A – EPOST ( 22 DAP) Cadre @ 4 oz/A – POST (36 DAP) Dual Magnum @ 16 oz/A – POST ( 36 DAP) Prowl H20 @ 34 oz/A - PRE Gramoxone @ 12 oz/A – EPOST (22 DAP) Storm @ 16 oz/A – EPOST (22 DAP) Dual Magnum @ 16 oz/A – EPOST ( 22 DAP) Cobra @ 12.5 oz/A – POST (36 DAP) Dual Magnum @ 16 oz/A – POST ( 36 DAP) 2,4-DB @ 18 oz/A – POST (36 DAP) Prowl H20 @ 34 oz/A - PRE Gramoxone @ 12 oz/A – EPOST (22 DAP) Storm @ 16 oz/A – EPOST (22 DAP) Dual Magnum @ 16 oz/A – EPOST ( 22 DAP) Ultra Blazer @ 24 oz/A – POST (36 DAP) Dual Magnum @ 16 oz/A – POST ( 36 DAP) 2,4-DB @ 18 oz/A – POST (36 DAP)
  10. Peanut Weed Control Programs Without Valor - 2014 NTC Prowl H20 @ 32 oz/A (PRE) Gramoxone @ 12 oz/A (17 DAP) Storm @ 16 oz/A (17 DAP) Dual Magnum @ 16 oz/A (17 DAP) Cadre @ 4 oz/A (39 DAP) Dual Magnum @ 16 oz/A (39 DAP) Prowl H20 @ 32 oz/A (PRE) Gramoxone @ 12 oz/A (17 DAP) Storm @ 16 oz/A (17 DAP) Warrant @ 48 oz/A (17 DAP) NIS @ 0.25% v/v (17 DAP) Cadre @ 4 oz/A (39 DAP) Warrant @ 48 oz/A (39 DAP) NIS @ 0.25% v/v (39 DAP) PE-07-14 July 30 96 DAP
  11. Warrant Label Change (Hopefully?) Old Label Warrant may be applied postemergence to peanut at 1.25 to 2 quarts per acre after crop emergence and before flowering. Proposed New Label? Warrant may be applied postemergence to peanut at 1.25 to 2 quarts per acre after crop emergence up through the R1 growth stage (beginning bloom).  R1 ends as 50% of the plants in an area have a visible peg (R2).  
  12. 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
  13. 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, 2011-2014. NTC (lbs/A) 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) PE-06-14 (GA-06G) PE-06-14 (GA-09B) PE-08-14 (GA-12Y) n = 62 6000 = 5802 (97%)
  14. A Comparison of Irrigated Weed-Free Peanut Yields Between NTC and Gramoxone (12 oz/A) + Storm (16 oz/A) + Dual Magnum (16 oz/A) fb Cadre (4 oz/A) + Dual Magnum (16 oz/A) Treatments in Georgia, 2012-2014. NTC (lbs/A) G + S + DM fb C + DM (lbs/A) PE-06-12 PEA03-12 PE-12-13 PE-13-13 PE-06-14 PE-08-14 n = 25 6000 = 5862 (98%)
  15. My Opinion We are at the point now that 2,4-DB needs to be included with all of our 30-45 DAP POST treatments. Why? Improved control of Palmer amaranth, sicklepod, and annual mg. Not really that expensive (~$2.75/A for 18 oz/A of 1.75 lb gal) Cadre + Dual or Warrant* + 2,4-DB Cobra or Ultra Blazer + Dual or Warrant* + 2,4-DB When Warrant is used, add NIS @ 0.25% v/v. No negative yield effect in 2014 field trials *Assuming Warrant label change
  16. Cobra @ 12 .5 oz/A + Dual Magnum @ 16 oz/A + 2,4-DB @ 18 oz/A - 2 DAT Cobra @ 12.5 oz/A + Warrant @ 48 oz/A + 2,4-DB @ 18 oz/A + NIS @ 0.25% v/v – 2 DAT
  17. Cobra + 2,4-DB + Dual or Warrant - 2014 Cobra @ 12.5 oz/A Dual Magnum @ 16 oz/A 2,4-DB @ 18 oz/A 3 DAT Cobra @ 12.5 oz/A Warrant @ 48 oz/A 2,4-DB @ 18 oz/A NIS @ 0.25% v/v 3 DAT PE-01B-14 June 20 3 DAT
  18. Cadre (CD), Cobra (CB), 2,4-DB, Dual Magnum (DM), and Warrant (W) Effects on Peanut Yield - I PE-01-14 Averaged over 2 timings (29 and 44 DAP) P = 0.2773
  19. Cadre (CD), Cobra (CB), 2,4-DB, Dual Magnum (DM), and Warrant (W) Effects on Peanut Yield - II PE-01B-14 Averaged over 2 timings (34 and 44 DAP) P = 0.1605
  20. Tank-Mixtures The Impossible Dream 17 POST herbicides 21 fungicides 16 insecticides B or Mn NIS or COC 7 am, 12 pm, 5 pm, 10 pm 91,392 possible combinations 4 reps = 365,568 plots I do ~2640 plots/year Thus, it would take me 138.5 years if I dropped everything else
  21. The Tank-Mixes Blues! Reflex Zidua B-Moly Glyphosate Brandt Smart Trio (N + S + B + Mn + Zn) *Always pre-slurry dry formulations in water before adding to tank!!!
  22. Select Max @ 16 oz/A + NIS @ 0.25% v/v fb Priaxor @ 6 oz/A + Boron @ 1 qt/A Applied 1 hour later Photo = 3 DAT
  23. Cadre + 2,4-DB + Dual Magnum + Priaxcor – 3 DAT PE-99-14 June 20 3 DAT
  24. Peanut (GA-12Y) Yield Response (lb/A) to Odd Tank-Mixtures - 2014 LSD 0.10 = 197 CV = 2 C = Cadre @ 4 oz/A D = Diamond @ 9 oz/A AB = Absolute @ 5 oz/A NIS = Induce @ 0.25% v/v DB = 2,4-DB @ 18 oz/A AC = Acephate @ 6 oz/A DM = Dual Magnum @ 16 oz/A PX = Priaxor @ 8 oz/A Applied 34 DAP
  25. Dual Magnum, Warrant, Zidua, Fungicide Tank-Mixes 2014 No negative yield effects when tank-mixed with Tilt/Bravo, Abound, Fontelis, Provost, Priaxor, Artisan, Absolute. More likely to see peanut leaf burn with Dual Magnum mixtures.
  26. Dual Magnum @ 21 oz/A + Tilt/Bravo @ 32 oz/A – 7 DAT
  27. Our Next Resistance Issue or Timing Issue???? Terrell Co., September 2014
  28. Sicklepod Survey Fall 2014 Sicklepod seed collected from Berrien, Colquitt, Decatur, Dooly, Early, Evans, Pierce, Sumter, Tattnall, Tift, Terrell 29 populations
  29. 2014 Sicklepod Seed Survey
  30. Perennial Weeds in Peanut - I horsenettle dogfennel trumpetcreeper
  31. Perennial Weeds in Peanut - II Will take a few years to get under control Fall applications of glyphosate After digging but 2 weeks before 1st frost Long-term program Virginia creeper Maypop passionflower
  32. New Labels 2016? Zidua 85WG = pyroxasulfone (BASF) Anthem Flex 4SE = Zidua + Aim (FMC) 3.733 lbs Zidua + 0.267 lbs Aim POST With Gramoxone and/or Cadre UGA will not support PRE use Why? No 2X safety margin
  33. Anthem Flexx Injury from POST Apps PE-12B-14 June 19
  34. What do the top growers do? 2013 Georgia Peanut Achievement Club Winners 10 growers 6283 lb/A average yield GA State Avg. = 4430 lb/A 10/10- irrigated 7/10 – bottom plow 10/10 – twin rows Rotation (Peanut) 1-4 years = 2/10 1-3 years = 8/10 Herbicides 9/10 – Sonalan 10/10 – Valor 3/10 – Dual 9/10 – Cadre 3/10 – 2,4-DB 1/10 – Prowl 2/10 - Strongarm
  35. Questions??? eprostko@uga.edu www.gaweed.com