![]() In advanced stages, leaves become ragged. In early stages, the fungus develops along the veins and becomes purplish to red in color. ![]() The center of the lesion is dark brown with purplish to red borders. Infected seed are marked by dark, sunken lesions that extend through the seed coat. Follow a three year rotation.Īnthracnose (fungus – Colletotrichum lindemuthianum): This is a seed-borne fungus which attacks all above ground portions of the plant. Avoid spreading the disease by not entering the field when the foliage is wet. To control bacterial blight of beans, seed grown in the western United States should be planted. Both bacteria can live in the soil for two years on plant residue. ![]() Common blight is more of a problem in warm weather while halo blight is favored by cool temperatures. Rain and damp weather encourage development of these diseases. Entry into the plant is through the leaf stomata. Infected leaves with halo blight turn yellow and slowly die while those with common blight turn brown and drop quickly. Common blight-infected pods do not exhibit the greenish-yellow halo around the lesion like halo blight lesions. ![]() When the plant begins to set fruit, lesions are formed at the nodes which girdle the stem. Stem lesions appear as long, reddish colored spots. phaseoli): Plants infected with the halo blight bacterium form greenish-yellow circles around each lesion. phaseolicola) Common Blight (bacterium – Xanthomonas campestris pv. Bacterial Blights: Halo Blight (bacterium – Pseudomonas syringae pv. ![]()
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