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Anthracnose


© Iowa State University

Pathogen(s) causing disease:

Colletotrichum truncatum

Symptoms:

Occur on leaves, stems and pods. Leaves have reddish veins and leaf rolling. On stems and petioles, symptoms appear as brown areas. Petiole infection may result in the uppermost leaves twisting downward (Shepard’s crook) or premature defoliation. As plants near maturity, stems, petioles and pods are covered in black spots (fungal bodies) that produce small black spines.

Conditions:

Warm, wet weather, especially during bloom or early pod development, favors disease development. Infection occurs when leaf wetness, rain or dew periods exceed 12 hours per day.

Management:

Scout from R5 through R7. It is especially important to scout seed production fields because the fungus that causes the disease can be seed transmitted. Crop rotation and crop residue incorporation will reduce inoculum by breaking down infested residue. Seed treatment fungicides should be used on seed planted from fields with high levels of anthracnose. In the southern US, foliar fungicide applications have been shown to be an effective way or reducing late season anthracnose.

Sources:

U of NE
ISU

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