Organizing Committee


Poster Presentations


Poster Presentations


Distribution of Asian soybean rust in Alabama 20042006

Presenter: M. A. Delaney

All authors and affiliations: M. A. DELANEY, E. J. Sikora, D. P. Delaney, and J. Mullen. Auburn University Extension System, Auburn, AL

Asian soybean rust (ASR) is caused by the fungus Phakopsora pachyrhizi. This fungus was originally identified in Japan in 1902 and has since traveled across Asia, Africa, and South America before discovered in the continental United States in 2004. The primary mode of spread of this disease is by spores carried on wind currents. It is theorized that spores of ASR were carried to the southeastern United States by wind currents associated with Hurricane Ivan. Initially, it was thought that soybean rust would not overwinter in Alabama due to its inability to withstand cold weather and requirements for live plant material for survival. However, the pathogen was found on kudzu (a semi-woody perennial vine that is susceptible to ASR) as far north as Montgomery, AL, during the mild winter of 2005/2006. In 2006, the mild temperatures combined with the protection provided by urban areas may allow kudzu/ASR survival. The disease in 2004 was most commonly found on green leaf tissue on older plants, and the impact was minimal. In 2005, the disease was found in 32 counties; however, there was no apparent significant yield loss in commercial soybeans, which may have been due to low disease incidence and unfavorable weather conditions for spread of the disease. In 2006, the disease continues to be found on late-season soybeans; however, due to unfavorable weather conditions, the effects appear to be minimal. However, growers should stay aware of rust development because significant damage can be caused in short periods of time.

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