Organizing Committee


Poster Presentations


Poster Presentations


Occurrence of soybean rust in Mississippi: An update in 2006

Presenter: S. Li

All authors and affiliations: S. LI (1), W. F. Moore (2), A. R. Milling (2), B. C. Wells (3), G. L. Sciumbato (3), B. L. Spinks (2), and M. L. Broome (2). (1) USDA-ARS, Crop Genetics and Production Research Unit, Stoneville, MS 38776; (2) Mississippi State University, MS 39762; and (3) MSU/Delta Research and Extension Center, Stoneville, MS 38776

The first detection of Asian soybean rust (ASR) caused by Phakopsora pachyrhizi in Mississippi on soybeans was in Adams County on November 16, 2004. Later that month, ASR was also found in Holmes, Jefferson, Warren, and Washington Counties. In July 2005, ASR was found in Pearl River and George Counties in Mississippi through the monitoring of sentinel plots. In 2006, ASR in Mississippi was first observed in one soybean field and one kudzu site in Jefferson County on August 1, 2006. At that time, soybeans in the southwest portion of the state were in reproductive growth stage R5. Application of fungicide was recommended. However, in the major soybean-growing areas in northeast Mississippi and the Delta, the extremely hot and dry conditions were unfavorable for rust development. As of October 2006, ASR was found in George, Jackson, Jefferson, Lee, Washington, and Yazoo Counties in 16 locations. ASR was identified by light and electron microscopic observations, enzyme-linked immunosorbent assay, and polymerase chain reactions using a specific primer set for P. pachyrhizi and was also checked with the primers for P. meibomiae.

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