Soybean Rust: Quarantine Exemptions
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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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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 l.jpg
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.


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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


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No Fungicides

With Fungicides

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


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Fungicides Registered in U.S. for Soybean Rust on Soybeans

  • Azoxystrobin (Quadris)

  • Chlorothalonil (Bravo and Echo)


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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


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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)


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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


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Limits of rustMN & 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


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Why So Many Fungicides? rust

  • Supply, Supply, Supply!!

  • Fungicide resistance management

  • Uncertain fungicide effectiveness


Fungicide resistance action committee frac www frac info l.jpg

Fungicide Resistance Action Committee (FRAC) rustwww.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


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Requests for “me too” Quarantine Exemptions for soybean rust

Arkansas Louisiana

Delaware Maryland

Illinois Nebraska

Indiana New York

Iowa Ohio

Kentucky


Web site on soybean rust http www ipmcenters org newsalerts soybeanrust l.jpg
Web Site on Soybean Rust 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

[email protected] [email protected]


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