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Diplodia Stalk Rot


© Purdue University, Plant and Pest Diagnostic Laboratory

Pathogen(s) causing disease:

Diplodia maydis

Symptoms:

Leaves turn grayish-green and eventually brown. Dark brown lesions extend in either direction from the node. Pith is disintegrated and discolored, stalks break easily. Tiny black bumps embedded in rind of lower stalk.

Conditions:

Warm, moist weather in late summer (2-3 weeks after silking), stresses that result in early senescence. Corn-on-corn rotation. Stress from other diseases or insect injury. Conservation tillage.

Management:

Resistant hybrids (full season hybrids tend to have more resistance than short season hybrids), balanced soil fertility, recommended plant population, control stalk-boring insects, reduce plant stress.

Sources:

Purdue University
University of Illinois

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