Slide Presentation

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

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TABLE OF CONTENTS
  1. 2015 Field Corn Weed Management Update
  2. Starting Clean
  3. Did you really start clean? A disk may not be good enough!
  4. Strongarm Carryover or Nematodes?
  5. Corn Injury - April 16
  6. Valor Drift on Field Corn
  7. Valor Injury - Applied V6 - 3 DAT
  8. Field Corn Yield Loss Caused By Valor SX 51WG
  9. Pay Closer Attention to Hybrid/Herbicide Mgt. Guidelines
  10. Atrazine + Any of these works just fine!
  11. Weed Control in Field Corn - 2014
  12. Weed Control in Field Corn - 2014
  13. Weed Control in Field Corn - 2014
  14. Are SU 'sensitive' hybrids tolerant of safened herbicides?
  15. Atrazine 4L + COC on Palmer Amaranth
  16. What about atrazine resistance?
  17. 2014 Atrazine Resistance Survey
  18. Palmer Amaranth vs Atrazine
  19. Atrazine Resistant Palmer Amaranth in GA Confirmed Counties as of October 2014
  20. Non-Atrazine or Glyphosate Weed Control Programs- Capreno
  21. Non-Atrazine or Glyphosate Weed Control Programs- Impact
  22. Non-Atrazine or Glyphosate Weed Control Programs- Callisto
  23. Something to think about?
  24. Herbicide Effects on Field Corn Yield in a High Input Environment - 2014
  25. Roundup W-Max + Atrazine + AMS Xtra Timing Effects on Field Corn Yield in a High Input Environment - 2014
  26. Morningglory Control in Field Corn
  27. Morningglory Control in Corn
  28. New (er) Stuff
  29. New for 2015 UGA Rec’s
  30. Anthem for Weed Control in Field Corn - 2014
  31. Corn Herbicides You Might Hear About But UGA is Not Recommending (Yet/Ever?)
  32. Enlist Herbicide Tolerant Corn
  33. Enlist Duo Label Requirements (10-09-14)
  34. Enlist Duo Nozzle Tips/Pressure
  35. Enlist Duo Sprayer Cleanout
  36. The Tank-Mixes Blues!
  37. Question/Comments



SLIDE CONTENTS
  1. Eric P. Prostko Professor/Extension Weed Specialist Dept. Crop & Soil Sciences 2015 Field Corn Weed Management Update
  2. Starting Clean If you are getting ready to plant and get to the field and have pigweed > 6” tall ………… Park the sprayer Go get your mower, disk, and/or bottom plow
  3. Did you really start clean???? A disk may not be good enough!
  4. Strongarm Carryover or Nematodes???
  5. Corn Injury – April 16 Pioneer 2023BVT Planted March 25 No ALS in 3 years pH = 6.21 P = 82.82 lbs/A (H) K = 90.32 lbs/A (M) Mg = 45.82 lbs/A (M) Mn = 9.26 lbs/A Zn = 2.7 lbs/A (M) Ca = 367 lbs/A (M) Nematodes Sting = 15 (1) Stubby Root = 4 Ring = 10
  6. Valor Drift on Field Corn
  7. Valor Injury – Applied V6 – 3 DAT 3 oz/A 1.5 oz/A 0.75 oz/A 0.375 oz/A 0.188 oz/A CN-02-14 May 1
  8. Field Corn Yield Loss Caused By Valor SX 51WG CN-02-14 Averaged over 2 timings (V2, V6) LSD 0.10 = 3
  9. Pay Closer Attention to Hybrid/Herbicide Mgt. Guidelines
  10. Atrazine + Any of these works just fine!
  11. Weed Control in Field Corn – 2014 NTC Roundup WMAX @ 22 oz/A Aatrex @ 64 oz/A Prowl H20 @ 32 oz/A POST Aatrex @ 32 oz/A - PRE Roundup WMAX @ 22 oz/A Aatrex @ 48 oz/A POST CN-12-14 May 20 15 days after POST
  12. Weed Control in Field Corn - 2014 NTC Atrazine – PRE Liberty – POST Atrazine - POST CN-15-14 May 22 51 DAP
  13. Weed Control in Field Corn – 2014 NTC Steadfast Q @ 1.5 oz/A Aatrex @ 64 oz/A COC @ 1% v/v POST CN-16-14 May 22 30 days after POST
  14. Are SU “sensitive” hybrids tolerant of safened herbicides? CN-05-14 Averaged over 2 hybrids DKC 62-08, DKC 64-69 LSD 0.10 = 9
  15. Atrazine 4L @ 2 qts/A + COC @ 1% v/v Applied to 4”-9” Palmer Amaranth (6” average) Photo 13 DAT
  16. What about atrazine resistance? 2014
  17. 2014 Atrazine Resistance Survey 11 samples collected Populations 1,2,3,5,and 10 = 0.5 lb ai/A Populations 4 and 6 = 1-2.5 lb ai/A Population 7 = 5 lb ai/A (Dodge) Population 9 did not germinate (Berrien) 12 and 13 ?????
  18. Atrazine Resistant Palmer Amaranth in GA Confirmed Counties as of October 2014 Berrien and Dodge 2X resistance level 5 lbs/A to control Evik will control
  19. Non-Atrazine or Glyphosate Weed Control Programs Capreno PE-09B-14 May 22 52 DAP NTC Dual II – PRE Capreno - POST COC - POST AMS XTRA - POST Warrant – PRE Capreno - POST COC - POST AMS XTRA - POST Zidua – PRE Capreno - POST COC - POST AMS XTRA - POST
  20. Non-Atrazine or Glyphosate Weed Control Programs Impact PE-09B-14 May 22 52 DAP NTC Dual II – PRE Impact - POST COC - POST AMS XTRA - POST Warrant – PRE Impact - POST COC - POST AMS XTRA - POST Zidua – PRE Impact - POST COC - POST AMS XTRA - POST
  21. Non-Atrazine or Glyphosate Weed Control Programs Callisto PE-09B-14 May 22 52 DAP NTC Dual II – PRE Callisto - POST COC - POST AMS XTRA - POST Warrant – PRE Callisto - POST COC - POST AMS XTRA - POST Zidua – PRE Callisto- POST COC - POST AMS XTRA - POST
  22. Something to think about? Some GA growers are pushing yield limits (250+ Bu/A) 75%-80% irrigated weed science researcher (me) typically does not make 225+ Bu/A yields At lower yield/input levels, are herbicide stresses masked by other stresses? At higher yield/input levels (i.e. most stresses are controlled), what about herbicides?
  23. Herbicide Effects on Field Corn Yield in a High Input Environment - 2014 CN-01-14 Applied 21 DAP V3-V4 Pioneer 1685 P = 0.4165 CV = 12.32
  24. Roundup W-Max (32 oz/A) + Atrazine (48 oz/A) + AMS Xtra (2.5% v/v) Timing Effects on Field Corn Yield in a High Input Environment - 2014 Pioneer 1685 P = 0.1430 CV = 6.56
  25. Morningglory Control in Field Corn
  26. Morningglory Control in Corn as much atrazine as possible 1.0 lb/A – PRE fb 1.5 lb/A – POST small grain rotations 2,4-D, Clarity, Status, Aim, ET, Evik (PDIR) Enlist Corn??? Liberty-Link® Corn Systems split applications of glyphosate (RR corn) * 1st application + atrazine Harvest Aids Aim Early-harvest
  27. New (er) Stuff
  28. New for 2015 UGA Rec’s FMC Zidua + Cadet 5 - 8 oz/A PRE or early POST (V4) Tank-mix with atrazine, glyphosate or glufosinate. Anthem ATZ = Anthem + atrazine MOA = 15 + 14
  29. Anthem for Weed Control in Field Corn - 2014 NTC NTC Anthem (PRE) Cadet (POST) Roundup W-Max (POST) AMS + COC (POST) CN-11-14 May 22 16 days after POST
  30. Corn Herbicides You Might Here About But UGA is Not Recommending (Yet/Ever?) Isoxaflutole + thiencarbazone + safener Isoxaflutole + safener acetochlor (2.7 lb) + atrazine (1.34 lb) acetochlor (3.1 lb) + atrazine (2.5 lb) Atrazine + s-metolachlor + mesiotrione + bycyclopyrone + safener
  31. Enlist™ Herbicide Tolerant Corn tolerance to 2,4-D and Assure + GLY Trait was deregulated in September 2014 and herbicide in October 2014 Colex-D™ technology 2,4-D choline lower volatility lower drift potential enhanced handling/mixing characteristics reduced odor 1 PRE application + 2 POST applications (30” or V8 stage); 30-48” = drops Enlist™ Duo DMA-Glyphosate (1.7 lb ae/gal) + 2,4-D choline (1.6 lb ae/gal) = 3.5-4.75 pt/A 2015 Product Launch IA, IL, IN, OH, SD, WI (first) AR, KS, LA, MN, MO, MS, NE, ND, OK, TN (next) 2,4-D choline
  32. Enlist™ Duo Label Requirements (10-09-14) Can only use nozzles and pressure listed on label (chart) Winds speeds < 15 MPH 30’ downwind buffer from sensitive areas Wind cannot be blowing toward tomatoes, other fruiting vegetables (Crop Group 8), cucurbits (Crop Group 9), grapes, and cotton Specific sprayer clean-out directions
  33. Enlist™ Duo Nozzle Tips/Pressure
  34. Enlist™ Duo Sprayer Cleanout
  35. 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!!!
  36. Question/Comments eprostko@uga.edu www.gaweed.com