The Plant Disease and Insect Diagnostic Clinic recently received some corn samples with symptoms and signs of crazy top, a disease caused by Sclerophthora macrospora. Symptoms of this disease vary greatly with time of infection and degree of host colonization by the pathogen. Generally, excessive tillering, rolling, and twisting of the upper leaves appear first. Later, infected plants produce a “leafy” tassel.
Iowa State University
Iriarte, Fanny and Robertson, Alison E., "Signs of Crazy Top in Corn" (2009). Integrated Crop Management News. 607.
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