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UC Pest Management Guidelines

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Corn

Exserohilum Root Rot

Pathogen: Exserohilum pedicellatum

(Reviewed 1/06, updated 1/06)

In this Guideline:

Symptoms
Comments on the disease
Management

SYMPTOMS

Exserohilum root rot causes brown lesions on primary roots and later on secondary roots of the first and second whorls. The affected roots become black and necrotic. Aboveground symptoms include wilting, stunting, and yellowing of leaves, but these symptoms are not always apparent.

COMMENTS ON THE DISEASE

The fungus is soilborne. Although factors influencing disease development are not well understood, stress caused by a fertility imbalance, overcrowding, etc. may favor disease development.

MANAGEMENT

Good cultural practices will help to prevent this disease. There are no registered fungicides available for this disease.

PUBLICATION

UC IPM Pest Management Guidelines: Corn
UC ANR Publication 3443
Diseases
R. M. Davis, Plant Pathology, UC Davis

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