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Bean Anthracnose



P_beananthracnose

Bean Anthracnose

Usually appear in

Spring and Summer


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Caused By:-     The Fungus Colletotrichum lindemuthianum

Description

Seedlings grown from infected seeds often have dark brown to black sunken lesions on the cotyledons and stems Severely infected cotyledons die early, and growth of the plants is stunted. Diseased areas may girdle the stem and kill young plants. Under moist conditions, small, pink masses of spores are produced in the damage areas. Spores produced may spread to the leaves. Symptoms generally occur on the underside of the leaves as linear, dark brick-red to black lesions on the leaf veins. As the disease progresses, the discoloration appears on the upper leaf surface. Leaf symptoms often are not obvious and may be overlooked when examining plants. The most striking symptoms develop on the pods. Small, reddish brown to black blemishes and distinct circular, reddish brown lesions are typical symptoms. Mature lesions are surrounded by a circular, reddish brown to black border with a grayish black interior. During moist periods, the interior of the lesion may exude pink masses of spores. Severely infected pods may shrivel, and the seeds they carry are usually infected. Infected seeds have brown to black blemishes and sunken lesions. Picture from Wikimedia Commons.


Control

Use certified seeds and bury plant remains. Rotation of crops will help. Resistant varieties of beans is available. Spraying will help, but not eradicate it.



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