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Pod and stem blight


© Iowa State University

Pathogen(s) causing disease:

Diaporthe phaseolorum var. sojae and Phomopsis longicola

Symptoms:

Dark lesions are found on the pod, petioles and nodes of the stem. No definite leaf or stem lesions are produced under field conditions. The upper portion of an infected plant turns yellow and dies. Pod blight phase results in poor quality seeds and seed decay.

Conditions:

Warm wet weather at R7 to R8 stages favors seed infection and decay.

Management:

Harvest in a timely manner to reduce risk of delayed harvest in wet weather. Rotate crops to reduce the survival of the fungus in soybean residue. Till fields with a history of Phomopsis seed rot, pod and stem blight to promote decay of residue. Growers should also consider using a seed treatment.

Sources:

Purdue
ISU

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