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Frogeye is most common in the southern United States during periods of warm, moist weather.
Symptoms of frogeye leaf spot occur primarily on leaves, although infection can also occur on stems, pods and seed. Lesions are small, circular to somewhat irregular spots that develop on the upper leaf surfaces. Initially the spots are dark and water-soaked in appearance. As the lesions age, the center becomes light brown to light gray in color. Older lesions have a light center with a darker red to purple-brown border. Lesions may merge to kill larger areas of the leaf surface. These areas may drop out, giving the leaves a very tattered or shot-hole appearance. When spots are numerous, leaves wither and drop prematurely. The fungus is spread by wind-blown rain and survives in crop debris and on seeds. Planting disease-free seed, selecting resistant varieties and rotating crops with at least one year between soybean crops are the primary controls for frogeye leaf spot. |
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