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9

Development of Asian soybean rust in Louisiana: 2004 to present

Presenter: Clayton A. Hollier

Other authors and affiliations: . Louisiana State University AgCenter, Plant Pathology and Crop Physiology, Baton Rouge, LA 70803, U.S.A.

Asian soybean rust (ASR), caused by Phakopsora pachyrhizi, was first discovered in North America just south of Baton Rouge, LA, on the Ben Hur Research Farm of the Louisiana State University AgCenter. This discovery changed the dynamics of disease management in soybeans throughout the United States but especially in the southern U.S. soybean production area. The development and spread of ASR has increased over time from its discovery in 2004 until the present. In November 2004, the disease was found in six civil parishes; in 2005, two parishes; in 2006, 26 parishes; and in 2007, 20 parishes (at this point in the season). Spread is environmentally dependant. Development of the disease after storm movement has been noted and is being studied critically. ASR was first found in Louisiana on November 6, 2004. Since that time it has been found earlier and earlier, with the 2005 sighting in mid-October, the 2006 sighting on June 30, and the 2007 initial report being May 9. This pattern indicates that the fungus that causes ASR may be overwintering in the coastal region of Louisiana on kudzu or another host that may be less affected by freezing temperatures during the winter months. If it is proven that the fungus does overwinter in Louisiana, then that would mean that ASR will be a factor for southern soybean production for years to come.

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