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Corn

Pythium Stalk Rot

Pathogens: Pythium aphanidermatum and other Pythium species

(Reviewed 1/06, updated 1/06)

In this Guideline:

Symptoms
Comments on the disease
Management

SYMPTOMS

Pythium stalk rot commonly becomes apparent when the plant suddenly falls over. Infection usually involves a single internode near the soil line. Diseased areas are dark brown, water-soaked, soft, and collapsed. The stalks may be twisted and distorted. Infected plants remain green and turgid for a short time after collapse because the vascular bundles remain intact.

COMMENTS ON THE DISEASE

Pythium stalk rot usually becomes evident shortly before or after the corn has tassled, although young, vigorous plants can be attacked. The disease is most often found in low spots in fields or in areas with poor drainage.

MANAGEMENT

Eliminate low areas in the field and improve drainage to prevent development of stalk rot.

PUBLICATION

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

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