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Photo courtesy of Clive Levy, Commercial Farmer’s Union of Zimbabwe

Soybean Rust: Quarantine Exemptions Kent L. Smith, Ph.D. USDA Office of Pest Management Policy June 29, 2004. Photo courtesy of Clive Levy, Commercial Farmer’s Union of Zimbabwe . Impact of Soybean Rust Yield Impact.

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Photo courtesy of Clive Levy, Commercial Farmer’s Union of Zimbabwe

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  1. Soybean Rust: Quarantine Exemptions Kent L. Smith, Ph.D. USDA Office of Pest Management Policy June 29, 2004 Photo courtesy of Clive Levy, Commercial Farmer’s Union of Zimbabwe

  2. Impact of Soybean RustYield Impact • Yield losses in soybeans – reported to be 10 to 50% of area yield where established, up to 90% or greater in selected fields • Minor crop impact – soybean rust pathogen has wide host range on leguminous crops – lima beans, black-eyed peas, kidney beans, green beans, etc.

  3. Impact of Soybean Rust Economic Impact • Economic impact on U.S. Economy – estimated by USDA/ERS in April 2004: www.ers.usda.gov • Yield Impacts from 0.9% to -9.5% (availability of fungicides & application equipment assumed) • Benefits of higher prices for soybeans and corn • Net losses of $0.2 to 2.0 billion/year

  4. No Fungicides With Fungicides Photo courtesy of Clive Levy, Commercial Farmer’s Union of Zimbabwe

  5. Fungicides Registered in U.S. for Soybean Rust on Soybeans • Azoxystrobin (Quadris) • Chlorothalonil (Bravo and Echo)

  6. Fungicides Registered in U.S. for Rust On Other Legumes (lima beans, green beans, kidney beans, cowpeas, pigeon peas, and others) • Azoxystrobin (Quadris) • Chlorothalonil (Bravo and Echo) • Pyraclostrobin (Headline) • Maneb (Manex) on dry beans • Myclobutanil (Laredo, Rally) on green beans

  7. Fungicides Requested to Control Soybean Rust on Soybeans under Quarantine Exemption (Section 18)by South Dakota and Minnesota • Propiconazole (Tilt, Propimax, Bumper) – Granted 4/23/04 • Tebuconazole (Folicur) • Myclobutanil (Laredo) – Granted 3/25/04 • Trifloxystrobin + propiconazole (Stratego) • Tetraconazole (Eminent) • Pyraclostrobin (Headline) • Boscalid + pyraclostrobin (Pristine)

  8. Requests for “me too” Quarantine Exemptions for soybean rust Apply for all 7 fungicides requested by SD & MN Follow EPA instructions for citing MN & SD quarantine exemption

  9. Limits of MN & SD Quarantine Exemptions Treat no more that 50% soybean acreage (EPA will consider 100% usage) Maximum of 2 applications total (EPA will consider 3 applications total) Rationale needed for greater usage longer season varieties environment more conducive to disease closer to overwintering sites

  10. Why So Many Fungicides? • Supply, Supply, Supply!! • Fungicide resistance management • Uncertain fungicide effectiveness

  11. Fungicide Resistance Action Committee (FRAC)www.frac.info For Strobilurins (azoxystrobin, pyraclostrobin, trifloxystrobin) used alone in only 1/3 of applications used in mixes in only 1/2 of applications For Triazoles (propiconazole, tebuconazole, myclobutanil, tetraconazole) alternate with other chemistries if possible

  12. Requests for “me too” Quarantine Exemptions for soybean rust Arkansas Louisiana Delaware Maryland Illinois Nebraska Indiana New York Iowa Ohio Kentucky

  13. Web Site on Soybean Rusthttp://www.ipmcenters.org/NewsAlerts/soybeanrust For more information on soybean rust, please contact: Kent SmithTeung Chin (Plant Pathology & Section 18s)(Registrations & Triazoles) 202-720-3186 301-734-8943 ksmith@ars.usda.gov teung.f.chin@usda.gov

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