Diseases of Potato: Late Blight

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Late blight of potato, caused by the fungus Phytophtora infestans, is potentially a very destructive disease of potato in Michigan. During favorable weather - periods of moderate temperatures, high humidities, and frequent rainfall - the disease can spread extremely rapidly by means of asexual spores known as sporangia, and it has the potential of completely  defoliating fields within three weeks of the first visible infections if no control measures are taken. In addition to blighting the foliage, the spores of the fungus can infect tubers before or during harvest, and lead to tuber rot.

Authors: 
M. L. Lacy
Authors: 
R. Hammerschmidt
Publisher: 
Michigan State University Extension
Year: 
1995