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Alternaria Blight
Alternaria blight is a fungal disease that has caused high losses in the field. The disease appears as spreading irregular brown lesions, often with light tan to whitish centers. The outer margin of the lesion generally is dark purplish to black. The lesion may or may not have a chlorotic zone surrounding the lesion. After moist periods, the undersides of lesions are covered with black spores that give the area a gray appearance.
The pathogen enters bean leaves and stems through wounds. The disease is most severe after hailstorms or other trauma that cause wounding. Little is known of the life cycle of the fungus, nor of chemical control.
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