Envirologix: Putting Science to the Test
Soybean Rust Plate
Asian soybean rust is a serious disease of soybeans caused by the fungus Phakopsora pachyrhizi. It was found for the first time in North America in November 2004. A second, similar-looking rust fungus, P. meibomiae, also infects soybeans but is much less virulent and occurs primarily in the western hemisphere. Both P. pachyrhizi and P. meibomiae infect numerous leguminous plant hosts.
After recognizing the imminent need for a fast and reliable test over a year ago, EnviroLogix developed an ELISA plate that can detect soybean rust in under two hours. As little as one spot on a leaf, even before sporulation, can be positively identified.
Asian soybean rust caused by Phakopsora pachyrhizi was first observed in Japan in 1902. Until recently the pathogen was distributed throughout Asia and Australia. It was reported from Hawaii in 1994. In the late 1990's asian soybean rust was found in Africa and in 2001 was reported in South America. As of 2004, Asian soybean rust in the Americas has been found in Argentina, Bolivia, Brazil, Paraguay, and Uruguay. In November 2004 Phakopsora pachyrhizi was found for the first time in the United States in Louisiana, and soon thereafter, in other southeastern U.S. states.
Source: USDA, Agricultural Research Service
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