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Entomology Image Gallery > Plant Diseases and Damage > Corn > Nigrospora Ear Rot Nigrospora ear rot Nigrospora ear rot. Dark gray or black mold is characteristic of this disease. It usually is more severe at the base of the ear, and the fungus also rots the cobs, causing them to fall off prematurely. ![]() This image appears in the following articles: Identifying ear rot diseases (October, 1996)Identifying ear rot diseases (October, 1996) |