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Bean Diseases

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Web blight on leaves and pods of bean. This disease is caused by Rhizoctonia solani, the asexual state of Thanatephorus cucumeris. Symptoms are circular, necrotic, light brown lesions with a lighter center.

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White mold on bean caused by Sclerotinia sclerotiorum. Under favorable conditions, stem, leaf and pod lesions may develop white cottony growth of external mycelium, resulting in plant death.

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Angular leaf spot caused by Phaeoisariopsis griseola. The pathogen causes lesions on leaves, pods, branches and petioles. Leaf lesions appear as gray or brown irregular spots with a chlorotic halo. If disease is severe, yield can be reduced up to 80%.

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Southern blight (southern stem rot or southern wilt) of beans is caused by the soil-borne fungus Sclerotium rolfsii. Early symptoms include yellowing of the lower leaves and browning of the hypocotyl below the soil line. Sclerotia form at the base of the plant as disease progresses.

Common bacterial blight on southern pea
Common bacterial blight caused by Xanthomonas campestris pv. phaseoli on leaves of southern pea. Infected seed are a primary source of the bacterium that causes this disease. Pods may also be infected.

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Anthracnose caused by Colletotrichum lindemuthianum on butter bean. This disease can affect all above-ground parts of the plant. Infected pods may shrivel and dry if disease is severe.

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Two diseases causing damage on bean pods - white mold (Sclerotinia sclerotiorum) and gray mold (Botrytis cineraria). Refer to "how to identify gray mold" for more information.

Last Updated: 7/5/2011 7:43:50 AM

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