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Asian rust alert:
June 21, 2005

Pathologists issue alert for soybean rust on dry beans

Three leading dry bean plant pathologists have issued an alert on the risk soybean rust poses to dry beans.

Howard F. Schwartz, Colorado State University extension plant pathologist; James R. Steadman, U of Nebraska plant pathologist and Marcial Pastor-Corrales, USDA-ARS plant pathologist at the Beltsville, Maryland, Vegetable Laboratory issued the report.

"With its wide host range, including many legume weeds like kudzu, and edible legume crop species, this fungal disease poses an unknown but potentially serious threat to future crops of soybean and possibly common bean (dry edible, snap) that will be grown during 2005 in southeastern U.S. and other regions east of the Rockies. Environmental patterns (storm movement, wind currents) could easily move soybean rust spores from southern states to midwestern to western regions during the upcoming months."

Little research has been done on Asian soybean rust's impact on dry beans.

"Preliminary evaluations at the USDA/ARS Ft. Dietrick (Md.) facility in the summer of 2004, and field observations in South Africa and Brazil during April of 2005, suggest that dry bean varieties do vary in their reactions to the Asian soybean rust pathogen and are not affected as severely as soybeans," the alert says. "In addition, preliminary observations suggest that infection severity of susceptible dry beans diminished if located more than 10 feet from infected soybeans."

What it looks like: Symptoms of Asian Soybean Rust.


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