Organizing Committee


Poster Presentations


Poster Presentations


Phakopsora pachyrhizi monitoring, detection, and epidemiology in Missouri during the 2007 soybean growing season

Presenter: Carol J. Murphy

Other authors and affiliations: Nathan W. Gross, Simeon Wright, Laura E. Sweets. University of Missouri, Columbia, Division of Plant Science, Columbia, MO 65211, U.S.A.

Missouri had 4.6 million acres of soybeans planted during the 2007 growing season. The impact of Asian soybean rust (ASR) is difficult to predict but has the potential to cause significant yield reduction, resulting in higher production costs and profit losses. Early detection of ASR is the key to effective management. Across the state, sentinel and commercial soybean plots and Pueraria lobata (kudzu) were sampled and evaluated weekly for the presence of the pathogen. The range of distribution for ASR in Missouri during the 2007 growing season was drastically different from previous years. Since 2004, Missouri has seen ASR in three of the four growing seasons. ASR was detected in 2004 and 2006 in the southeastern corner of the state, known as the Bootheel. Although it arrived too late in the season to cause economic damage, ASR was much more widespread in Missouri this year. This is most likely due to a shifted inoculum bank and favorable weather patterns. Samples from 37 counties proved positive for ASR, including the first confirmed find on kudzu. Our report will outline Missouri’s technique of scouting for and detecting ASR. Data on the increase in both incidence and severity over a 4-week period will also be presented from one southwestern Missouri county.

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