Organizing Committee


Poster Presentations


Poster Presentations


The effect of drought on Asian soybean rust in Alabama

Presenter: Mary Delaney

Other authors and affiliations: Edward Sikora, Dennis Delaney. Auburn University, Alabama Cooperative Extension System, Auburn, AL 36849-5624, U.S.A.

Asian soybean rust (ASR) will likely be a continuing problem for Alabama farmers based on the results of monitoring efforts over the last 3 years. ASR successfully survived on kudzu during the winters of 2005/2006 and 2006/2007. However, drought in 2006 and a late frost coupled with drought in 2007 has prevented ASR from being a significant problem for soybean growers outside of the Gulf Coast region of the state. For three consecutive years, ASR has first been detected on soybeans in Baldwin County in the southwest corner of Alabama in late June. Weather conditions have been more favorable for early-season development of ASR in this area, and most growers have followed a protective spray program with success. Growers in the remainder of the state subjected to two consecutive years of drought have used fungicides much less frequently since the threat of rust and other fungal diseases was minimal. In 2005, with moderate moisture conditions, ASR was detected in 35 counties. In 2006, ASR was detected in only 26 counties, with the majority of reports occurring late in the year. The drought of 2007 has resulted in a similar pattern. Mild winters during the last 2 years have allowed ASR to overwinter successfully in Alabama, but drought conditions have kept the disease from becoming a major problem. We suspect that a mild winter followed by a wet spring will result in a much more rapid spread of ASR in some upcoming year and growers will need to be prepared.

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