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Frogeye leaf spot of soybeans has been consistently diagnosed in several fields in Ohio throughout the past decade, especially on highly susceptible varieties. This disease is more common in the southern United States in regions with warm, humid environments. However, yield and seed quality reduction from this disease can still occur in Ohio, especially on food grade and seed production fields.
Comparison of frogeye leaf spot in a highly susceptible variety (left) to one with moderate levels of resistance (right).
Frogeye lesions scattered over the surface of the top of the leaf (left). The same lesions as viewed from the underside of the leaf (right). Note the “whisker” appearance inside lesions which are the conidia of this fungus.