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Crazy Top

© Purdue University, Plant and Pest Diagnostic Laboratory

Pathogen(s) causing disease:

Scleropthora macrospora


Partial to complete replacement of the normal tassel by a large, bushy mass of small leaves. No pollen is produced. Ear formation may also stop, causing ear shoots to be numerous, elongated, leafy and barren. Plants may be stunted or taller than average. 


Saturated soil conditions for 24-48 hours.


No highly effective control measures can be recommended for crazy top. Very little is known about the level of resistance in corn hybrids to this disease. Proper soil drainage will reduce the risk of flooding and subsequent infection. Avoid planting corn in low wet spots where the disease is known to occur.


Purdue University
The Ohio State University

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