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Figure 1. An epidemic of bean rust in the field. The plants on the left are resistant to this disease; those on the right are susceptible.

Figure 2. Pustules of bean rust on bean leaves. The necrotic or brown spots in the center of the lesion are pustules that produce many spores which spread the disease.

Bean rust is caused by a fungus called Uromyces appendiculatus. This disease can be devastating in commercial plantings of susceptible cultivars (Figure 1). Symptoms include necrotic spots surrounded by a chlorotic halo. The fungus produces spores in brown pustules in the centers of lesions and the spores are spread from plant to plant by the wind (Figure 2). 

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