Halo blight on beans

Halo blight on beans

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Credit: HOWARD SCHWARTZ/AGSTOCKUSA/SCIENCE PHOTO LIBRARY

Caption: Halo blight on green beans. Halo blight on green beans (Phaseolus vulgaris) is caused by the bacterium Pseudomonas syringae phaseolicola. Symptoms start as small watersoaked spots on leaves and pods, as seen here, which gradually turn dark brown. The spots remain small and become surrounded by a wide yellow-green halo. If left untreated, the plants usually die, due to their inability to continue making chlorophyll (the essential chemical in plants needed to make energy from sunlight). Halo blight is very contagious, particularly when plants are wet. The solution is to avoid working with wet plants and burn the affected plants to prevent spreading. Photographed in Colorado, USA.

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