The US Department of Agriculture’s Animal and Plant Health Inspection Service has confirmed the presence of soybean rust on soybean leaf samples taken from two plots associated with a Louisiana State University research farm.

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While this is the first instance of soybean rust to be found in the United States, the detection comes at a time when most soybeans have been harvested across the country. As a result of the harvest, the impact of the fungus should be minimal this year.


Soybean rust is caused by either of two fungal species, Phakopsora pachyrhizi, also known as the Asian species, and Phakopsora meibomiae, the New World species. The Asian species, the one found in Louisiana, is the more aggressive of the two species, causing more damage to soybean plants.


The USDA has advised farmers to watch for symptoms of the fungus during next year’s planting season.


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