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UPDATE ON WEED CONTROL IN GRAIN CROPS

UPDATE ON WEED CONTROL IN GRAIN CROPS. ANR Update 11-20-08 (Jim Martin / J.D. Green). HERBICIDE RESISTANT WEEDS IN KY. Smooth Pigweed Confirmed Photosystem II inhibitor (1987) ALS inhibitors (1992) Photosystem II + ALS inhibitors (2000) Johnsongrass

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UPDATE ON WEED CONTROL IN GRAIN CROPS

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  1. UPDATE ON WEED CONTROL IN GRAIN CROPS ANR Update 11-20-08 (Jim Martin / J.D. Green) UK Weed Sci

  2. HERBICIDE RESISTANT WEEDS IN KY • Smooth PigweedConfirmed • Photosystem II inhibitor (1987) • ALS inhibitors (1992) • Photosystem II + ALS inhibitors (2000) • Johnsongrass • ACCase inhibitors (1991) • ALS inhibitors (2006) • Marestail (Horseweed) • EPSP inhibitor (2002) • Italian Ryegrass • ACCase inhibitors (2004) UK Weed Sci

  3. GLYPHOSATE RESISTANT WEEDS & YR OF DISCOVERY UK Weed Sci

  4. MULTIPLE RESISTANCE FOR GLYPHOSATE- RESISTANT WEEDS UK Weed Sci

  5. Marestail Control UK Weed Sci

  6. BURNDOWN CONTROL OF MARESTAIL(UKREC 2008) UK Weed Sci Applied 5/9/08, Marestail 1.5 to 8” Avg 5.2”

  7. Restriction Interval between application of 2,4-D and soybean planting. Amine Ester Up to 0.5 lb ae/A 15 days 7 days >0.5 up to 1.0 lb ae/A* 30 days 30 days *Certain 2,4-D ester products require less than 30 days for rates between 0.5 to 1.0 lb ae/A. Weedone 650 (15 days) E-99 (15 days) Salvo (14 days) UK Weed Sci

  8. LODGED CORN IN 2008 AT UKREC RANGE: 54 to 83% AVG: 67% PHOTO: 9-25-08

  9. 1,114 Seed/4 Ft2

  10. Corn yield reduced 42 to 60 % due to interference from volunteer corn plants (Univ. of Illinois) UK Weed Sci

  11. Burndown Control of RR Corn (2007)Paraquat Alone vs Paraquat + Lorox UK Weed Sci (Source: Martin, UK)

  12. Burndown Control of RR Corn (2007)Paraquat Alone vs Paraquat + Sencor UK Weed Sci (Source: Martin, UK)

  13. Burndown Control of RR Corn (2007)Paraquat Alone vs Liberty UK Weed Sci (Source: Martin, UK)

  14. Burndown Control of RR Corn (2007)Paraquat Alone vs Select MAX UK Weed Sci (Source: Martin, UK)

  15. Herbicide Options for Replanting Field Corn or Control of Volunteer Corn Based on Previous Corn Hybrid Grown UK Weed Sci

  16. Controlling Corn with Glyphosate UK Weed Sci

  17. Controlling Corn with Paraquat + Linex Gramoxone Inteon (2.5 to 3.5 pt/A) or Firestorm or Parazone (1.67 to 2.33 pt/A + Linex (0.67 to 1 pt/A) + Surfactant (02.5 to 0.5 %) Use high rates when corn is 7 to 12” tall UK Weed Sci

  18. Controlling Corn with Select MAX Select MAX (6 fl oz/A) + Surfactant (0.25 % v/v) + AMS (2.5 to 4 lb/A) - Apply to Field Corn up to 12” tall - Replant no sooner than 6 days after application UK Weed Sci

  19. One Volunteer Corn Clump / 8 ft2 • Reduces Soybean Yield 25% Source: Becket & Stoller 1988 UK Weed Sci

  20. Soybean Herbicides Labeled For Controlling Volunteer Corn * Price does not include cost of application or adjuvants UK Weed Sci * * Will not Control Glyphosate -Tolerant Volunteer Corn.

  21. CORN HERBICIDE UPDATEPostemergence • Halex (glyphosate+S-metolachlor+mesotrione) • Ignite 280 SL (glufosinate)* • Laudis (tembiotrione) • Resolve Q (rimsulfuron + thifensulfuron)** • Require Q (rimsulfuron + dicamba) * Liberty (glufosinate) ** Resolve SG ( thifensulfuron) applied pre & post) UK Weed Sci

  22. SOYBEAN HERBICIDE UPDATE • Authority Assist (sulfentrazone + imazethapyr) • For soil residual control • Envive (chlorimuron + thifensulfuron + flumioxazin) • For burndown & soil residual control • First Shot (thifensulfuron + tribenuron) • For burndown control • Gangster (cloransulam + flumioxazin) • For burndown & soil residual control • Ignite 280 SL (glufosinate) • For postemergence (in LL varieties) & burndown control • Spartan Advance (sulfentrazone + glyphosate) • For burndown & soil residual control UK Weed Sci

  23. WHEAT HERBICIDE UPDATE • Harmony Extra SG & Harmony SG Forage Uses • Grazing 7 days, Feeding of forage 7 days; Hay 30 days • Harvested straw can be used for bedding and/or feed • Grain 45 days (for Harmony Extra SG) • Finesse Grass & Broadleaf (chlorsulfuron + flucarbazone) • Olympus Flex (propoxycarbozone +mesosulfuron) • Preemergence Ryegrass Control/Suppression: • Axiom(flufenacet + metribuzin) • Finesse (Report Extra) (chlorsulfuron + metsulfuron) • Prowl H2O (pendimethalin) UK Weed Sci

  24. PENDING REGISTRATIONS • Corn: • Balance Flexx (isoxaflutole + safener)* • Caprino (tembotrione + thiencarbazone + safener) • Corvus (isoxaflutole + thiencarbazone + safener) • Sharpen (saflufenacil) • Integrity (saflufenacil + dimethenamid) • Soybean: • Sharpen(saflufenacil) • Optill (saflufenacil + imazethapyr) • Wheat • PowerFlex (pyroxsulam) • Sharpen (saflufenacil) *Balance PRO (isoxaflutole) UK Weed Sci

  25. Herbicide Tolerant Crop Technology UK Weed Sci

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