Slide Presentation

TITLE    (click title to view slides)
2011 Corn Weed Control Update

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

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TABLE OF CONTENTS
  1. 2011 Corn Weed Control Update
  2. Topics for Discussion
  3. Atrazine Evaluation Update
  4. 2007, 2008, 2010 Macon County Triazine-Resistance Survey
  5. Macon County Resistance Survey
  6. Macon County Resistance Survey
  7. RR Corn Control (Pioneer 33M57) 7 DAT - 2010
  8. RR Corn Control (Pioneer 33M57) 40 DAT -2010
  9. Q Products
  10. Accent vs. Steadfast Q - 2010
  11. What about Liberty-Link Corn? (different mode of action compared to glyphosate)
  12. Weed Control in LL-Field Corn - 2010 Macon County - 47 DAP
  13. Concerns About LL Crops
  14. GR-Amaranthus sp.
  15. Palmer Amaranth Control Tactics -- Field Corn
  16. Palmer Control in Field Corn
  17. Roundup + Atrazine + Prowl - 2010
  18. Halex GT - 2010
  19. Post-Harvest AMAPA Problems
  20. When can we stop worrying about Palmer seed production?
  21. Other Herbicides We Might Need to More Seriously Consider in GA Field Corn?
  22. Callisto 4SC
  23. Callisto 7 DAT
  24. Laudis 3.5SC
  25. Laudis -- 2010 51 DAT
  26. Status 56WG
  27. GR-Palmer Amaranth Control in Field Corn with Status (70 DAT)
  28. On the Horizon
  29. DHT Corn
  30. DHT Systems-- 2010 Palmer Amaranth (GR) + Crabgrass
  31. Weed Control in Georgia Field Corn with Zidua Applied PRE (Photo @ 32 DAT)
  32. Capreno (3 oz/A) + COC (1% v/v) + 28% UAN (2.5% v/v)
  33. For More Weed Science Info



SLIDE CONTENTS
  1. 2011 Corn Weed Control Update Eric P. Prostko Extension Weed Specialist Dept. Crop & Soil Sciences
  2. Topics for Discussion Atrazine Review RR Corn Control (replant) Steadfast Q LL Corn Palmer Amaranth New (er) Products
  3. Atrazine Evaluation Update October 2009 – EPA calls for New Evaluation Scientific Advisory Panel (SAP) Meetings Human Health Effects February, April, September (2010) At September meeting, results of NCI Agricultural Health Study were not available Additional SAP meeting sometime in 2011 Then, SAP review of atrazine effects on amphibians and aquatic ecosystems Registration review in 2013?
  4. 2007, 2008, 2010 Macon County Triazine-Resistance Survey
  5. Macon County Resistance Survey
  6. Macon County Resistance Survey
  7. RR Corn Control (Pioneer 33M57) 7 DAT - 2010 NTC SelectMax 0.97EC @ 6 oz/A Induce @ 0.25% v/v AMS X-TRA @ 2.5% v/v Gramoxone Inteon 2SL @ 40 oz/A Atrazine 4L @ 32 oz/A Agridex @ 1% v/v
  8. RR Corn Control (Pioneer 33M57) 40 DAT -2010 NTC (123 Bu/A) SelectMax 0.97EC @ 6 oz/A Induce @ 0.25% v/v AMS X-TRA @ 2.5% v/v (0 Bu/A) Gramoxone Inteon 2SL @ 40 oz/A Atrazine 4L @ 32 oz/A Agridex @ 1% v/v (27 Bu/A)
  9. Q Products Accent 75DG 0.67 oz/A (0.031 lb ai/A) Steadfast Q 37.7DG 1.5 oz/A Accent (0.024 lb ai/A) i.e. 0.5 oz/A Resolve (0.012 lb ai/A) Isoxadifen (safener)
  10. Accent vs. Steadfast Q - 2010 CN-04-10 June 4 53 DAT NTC Accent 75 WDG @ 0.67 oz/A Atrazine 4L @ 48 oz/A Primary @ 1% v/v Steadfast Q 37.7WDG @ 1.5 oz/A Atrazine 4L @ 48 oz/A Primary @ 1% v/v
  11. What about Liberty-Link Corn? (different mode of action compared to glyphosate) Glufosinate Ignite 2.34SL (22 oz/A) 44 oz/A year (total) up to 24” or V7 (OT) or 24”-36” (drops) Tank-mix with atrazine good on morningglory, Texas millet, sicklepod, small Palmer (3” or less)
  12. Weed Control in LL-Field Corn - 2010 Macon County - 47 DAP NTC Ignite 280 2.34SL @ 22 oz/A Atrazine 4L @ 1 qt/A N-Pak AMS @ 2.5% v/v Applied 24 DAP
  13. Concerns About LL Crops Residual Important 1 may not be enough Abuse of Ignite LL cotton, corn, soybeans may jeopardize future technologies (DHT, Dicamba) Current Resistant Weeds Goosegrass (Malaysia)
  14. Amaranthus rudis Amaranthus palmeri Kentucky Tennessee Missouri Illinois Mississippi Georgia S Carolina N Carolina Alabama Louisiana 4 Counties in Mid-South Arkansas Larry Steckel (UT) September 2010 GR-Amaranthus sp.
  15. Palmer Amaranth Control Tactics – Field Corn Start Clean!!!!! Irrigation Tillage Extreme Cover Crops Residual Herbicides More than 1 Timely POST’s Post-Harvest
  16. Palmer Control in Field Corn Residuals Atrazine Dual Magnum/Generics Micro-Tech RR corn Glyphosate + atrazine + Prowl Expert Halex GT ( + atrazine?) LL Corn Ignite + atrazine + Prowl(?) Conventional Steadfast Q + atrazine (ALS?) Laudis + atrazine Callisto + atrazine
  17. Roundup + Atrazine + Prowl - 2010 NTC RUWM 5.5SL @ 22 oz/A Atrazine 4L @ 1.5 qt/A Prowl H20 @ 1 qt/A CN-04-10 June 4 53 DAT
  18. Halex GT - 2010 CN-14-10 June 3, 2010 51 DAT NTC Halex GT 4.39SC @ 3.6 pt/A 80/20 @ 0.25% v/v AMS X-TRA @ 2.5% v/v
  19. Post-Harvest AMAPA Problems Decreasing daylight hastens flower and seed production Flowering (3-4 weeks) Seed production (2-3 weeks) Some germination at 410F (8%) Control Options Mowing Tillage Herbicides paraquat + 2,4-D amine or dicamba Residuals i.e Dual Magnum? When can we stop worrying about seed production? Keeley et al. 1987. Weed Science 35:199-204 Steckel et al., 2004. Weed Science 52:217-221
  20. When can we stop worrying about Palmer seed production? Source: UGA Automated Environmental Monitoring Network Tifton Campus Conference Center
  21. Other Herbicides We Might Need to More Seriously Consider in GA Field Corn?
  22. Callisto 4SC Syngenta POST 3 oz/A + COC + UAN or AMS ($12-13/A) Up to 30” tall or 8-leaf corn Palmer amaranth up to 5” Tank-mix with atrazine Callisto Xtra also good on horsenettle Interaction with OP’s Weak on PANTE and CASOB Good option for atrazine, ALS and GR-Palmer Unique mode of action “Bleacher”
  23. Callisto 7 DAT NTC Callisto 4SC @ 4 oz/A Agrioil @ 1% v/v AMS @ 1.28 lb/A CN-01-09
  24. Laudis 3.5SC Bayer Tembotrione + isoxadifen (safener) “Bleacher” POST 3 oz/A Emergence to V8 stage Requires use of MSO and nitrogen Good for pigweed management Also has crabgrass and BL signalgrass listed on label No OP interaction Is it as good as Accent/Steadfast Q on Texas millet?
  25. Laudis – 2010 51 DAT NTC Laudis 3.5SC @ 3 oz/A Atrazine 4L @ 16 oz/A MSO @ 1% v/v AMS @ 2.5% v/v CN-14-10
  26. Status 56WG BASF dicamba + diflufenzopyr + isoxadifen “Super” Banvel + safener POST 5-10 oz/A ($2.20/oz) broadleaf weed control only no residual
  27. GR-Palmer Amaranth Control in Field Corn with Status (70 DAT) NTC Status 56WG @ 5 oz/A NIS @ 0.25% v/v AMS @ 3 lb/A EPOST (21 DAP) CN-01-08
  28. On the Horizon DHT Corn DowAgroScience Herbicide Tolerance Enhanced tolerance to 2,4-D and “fops” Stacked with glyphosate 2013? Herbicides Zidua (pyroxasulfone) - BASF Capreno (Laudis + thiencarbazone + isoxadifen) - Bayer
  29. DHT Corn
  30. DHT Systems– 2010 Palmer Amaranth (GR) + Crabgrass NTC Durango DMA 4SL @ 16 oz/A Weedar 64 3.8SL @ 17 oz/A N-PAK AMS @ 2.5% v/v CN-10-10 9 DAT
  31. Weed Control in Georgia Field Corn with Zidua Applied PRE (Photo @ 32 DAT) NTC Zidua 85WG @ 1.67 oz/A Atrazine 4L @ 1.5 qt/A (0.09 lb ai/A) CN-02-08
  32. Capreno (3 oz/A) + COC (1% v/v) + 28% UAN (2.5% v/v) CN-13-10 May 13 43 DAP NTC EPOST (14 DAP) MPOST (23 DAP)
  33. For More Weed Science Info www.gaweed.com