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12

2009 Soybean rust monitoring in Mississippi

Presenter: T. W. Allen

All authors and affiliations: T. W. ALLEN (1), W. F. Moore (2), A. R. Milling (2), M. L. Broome (2), J. Bridgers (3). (1) Mississippi State University, Stoneville, MS; (2) Mississippi State University, Mississippi State, MS; (3) Jimmy Sanders, Inc., Tchula, MS

Since the initial detection of soybean rust (SBR) in the continental United States in November 2004, SBR has been identified in 20 states. Shortly after the detection of the disease in the United States, SBR was detected in Mississippi in December 2004. Since that time, SBR has been detected in an ever increasing number of counties each year and, in 2009, was detected in all 82 counties in Mississippi. As opposed to previous years when SBR was typically detected first in a southern county, in 2009, SBR was first detected in the Delta, where approximately 75% of Mississippi’s soybeans are planted. The first detection occurred on August 6, which historically was the earliest detection of SBR in the Delta. Weather conditions throughout the last half of the growing season were conducive for SBR development and paired with a later soybean crop meant that SBR was widespread and in some cases infection resulted in a yield loss. This is the first year for a yield loss to be reported from Mississippi that could be specifically attributed to SBR. In addition to weekly monitoring of the 22 planted soybean sentinel plots, 256 unique kudzu patches and 443 production soybean fields were scouted throughout the season in an effort to detect the disease and make the best management suggestions. Timely fungicide suggestions to producers were broadly disseminated with the aid of the soybean rust hotline, newsprint, radio, and television interviews.

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