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Asian Soybean Rust

Phakopsora pachyrhizi (H. Sydow & Sydow)
Soybean Rust Soybean Rust
Reid Frederick, USDA ARS

Hosts include soybean (Glycine max) and kudzu (Pueraria montana), as well as common bean (Phaseolus vulgaris), and other legumes.


Commodities Affected:
Field Crops, Fruits and Vegetables



Asian soybean rust has caused significant crop losses in many areas of the world. When untreated, soybean rust causes yield losses due to premature defoliation, fewer seeds per pod and decreased number of filled pods per plant.



Asian soybean rust was limited to the Eastern Hemisphere until the 1900's. The disease has caused extensive losses in South America in recent years, and was first detected in the continental united States in November 2004. Since then, the disease has been found in several southern states. In October 2006, Asian soybean rust was detected on soybean leaf samples from 6 Indiana counties (Know, Vanderburgh, Pike, Posey, Warrick, and Tippecanoe). Incidence was low, and the disease had no impact on yield in 2006. Soybean sentinel plots are established and monitored throughout the growing season for early detection of the disease