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WEED MANAGEMENT ISSUES

WEED MANAGEMENT ISSUES. Pigweeds Marestail Control Volunteer Corn Herbicide Update. Turn Out the Lights - The Party’s Over. Aaron G. Hager Department of Crop Sciences University of Illinois. Lyrics. Turn out the lights, the party’s over They say that all good things must end

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WEED MANAGEMENT ISSUES

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  1. WEED MANAGEMENT ISSUES Pigweeds Marestail Control Volunteer Corn Herbicide Update

  2. Turn Out the Lights -The Party’s Over Aaron G. Hager Department of Crop Sciences University of Illinois

  3. Lyrics Turn out the lights, the party’s over They say that all good things must end Let’s call it a night the party’s over And tomorrow starts the same old thing again ?

  4. Waterhemp Spp. • Common Waterhemp (Amaranthus rudis) • Tall Waterhemp (Amaranthus tuberculatus)

  5. Waterhemp Spp. Source: Dr. Aaron Hager, Univ of IL

  6. Palmer Amaranth

  7. Palmer Amaranth in Fulton County - 2009 Dr. Bill Witt Cam Kenimer

  8. Vegetative Characteristics of Pigweeds In KY

  9. Reproductive Characteristics of Pigweeds In KY

  10. COMPARASION OF FLOWERING STRUCTURES

  11. WATERHEMP & PALMER AMARANTH BIOLOGY CREATE CHALLENGES FOR SOYBEAN GROWERS • Prolific seed producers. Seed scattered with combines. • Dioecious (male & female plants). Pollen flow contributes to dispersal. • Multiple events of plant emergence throughout the season. • Palmer grows rapidly and difficult to control: • 3” tall with Flexstar • 5” to 6” tall for Ignite in LL soybean.

  12. TYPES OF HERBICIDE RESISTANCE IN MAJOR PIGWEED SPECIES IN THE US X = Resistance has been documented. Most of these confirmed based on criteria in International Survey of Herbicide Resistant Weeds (11-07-09)

  13. HERBICIDE OPTIONS FOR WATERHEMP CONTROL IN SOYBEAN • Authority Assist • Authority First / Sonic • Authority MTZ • Boundary • Envive • Gangster • Linex • Prefix • Spartan • Valor Sx / Encompass • Valor XLT • Cobra • Flexstar • Reflex • Ultra Blazer SOIL APPLIED POSTEMERGENCE

  14. HERBICIDE OPTIONS FOR WATERHEMP CONTROL IN SOYBEANS SOIL APPLIED • Linen • Prefix • Spartan • Valor Sx / Encompass • Valor XLT • Authority Assist • Authority First / Sonic • Authority MTZ • Boundary • Envive • Gangster POSTEMERGENCE • Cobra • Flexstar • Reflex • Ultra Blazer

  15. HERBICIDE OPTIONS FOR PALMER AMARANTHCONTROL IN SOYBEANS SOIL APPLIED • Authority First/Sonic • Authority MTZ • Valor Sx / Encompass • Valor XLT • Dual • Intrro • Prefix • Prowl • Sencor • Treflan > POSTEMERGENCE • Cobra • Flexstar • Ultra Blazer • Ignite in LL soybeans >

  16. Burndown Control of Marestail 2,4-D ester Sharpen Optill Ignite

  17. VOLUNTEER CORN IS A WEED 1 Volunteer Corn Clump/8 ft2 • Reduces Soybean Yield 25% Source: Becket & Stoller 1988 Corn yield reduced 42 to 60 % due to interference from volunteer corn plants (Source Univ. of Illinois) UKWeed Sci

  18. Herbicide Options for Controlling Unwanted Corn Plants Prior to Planting Field Corn * SELECT MAX Replant no sooner than 6 days after application UK Weed Sci

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

  20. Corn Herbicide Update • Sharpen (saflufenacil) * • Integrity (saflufenacil + dimethenamide) * • Corvus (isoxaflutol + thiencarbazone) • Accent Q (nicosulfuron + safener) • Steadfast Q (nicosulfuron + rimsulfuron + safener) • Valor (14-Day EPP) * Kixor technology

  21. Soybean Herbicide Update • Sharpen (saflufenacil) * • Optill (saflufenacil + imazethapyr) * • Envive (chlorimuron + thifensulfuron + flumioxazin) • Ignite 280 (glfosinate ) Burndown & Post in LL soybean * Kixor technology

  22. Wheat Herbicide Update • PowerFlex (pyroxsulam)

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