First report of soybean rust caused by Phakopsora pachyrhizi in the continental United States

First report of soybean rust caused by Phakopsora pachyrhizi in the continental United States

2005

A:PS

Asian soyabean rust, caused by P. pachyrhizi, has been known to occur in the eastern hemisphere for nearly a century. More recently, it was reported from Hawaii in 1994, eastern and southern Africa from 1996 to 1998, Nigeria in 2001, and Brazil and Paraguay in 2002. Since soyabean rust was observed at ~5 degrees N latitude in South America before several hurricanes impacted the continental United States in September 2004, it seems likely that the introduction was associated with at least one of these tropical storms, especially hurricane Ivan. Symptoms of the disease were first observed on soyabean in the continental United States on 6 November 2004 in a field near Baton Rouge, Louisiana. Morphological and molecular data confirmed the pathogen. This is thought to be the first report of P. pachyrhizi in the continental United States.

v.89(7):774, PLANT DISEASE

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