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Diplodia Ear Rot

© Purdue University, Plant and Pest Diagnostic Laboratory

Pathogen(s) causing disease: Diplodia maydis


Infection usually starts at the base of the ear or from the stalk into the shank. White mycelial growth covers the kernels and pycnidia may be found on rotted kernels, husks adhere tightly, infected ears remain erect when infection occurs early in ear development. 


Dry weather prior to silking, followed by wet conditions within first 30 days after silking. It can be a problem in storage if grain moisture is 20 per cent or above.


Resistant hybrids, crop rotation, clean plowing, harvest early to prevent weathering. Dry corn to 15 per cent moisture content and below to prevent further mold growth in storage.


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