On bean, germinating seeds and seedlings are attacked by this pathogen. Reddish spots, which can be sunken, expand to kill the plants. Reddish-brown to brown collar rots are common on young plants. These rots inhibit normal growth and cause stunting or plants with poor vigor. Callus formation and thickening of the collar area also occurs.
Root rots form at any time.
Extensive root rots cause plants to decline and yields are reduced. Pod rots are brown to greenish-brown, mostly circular, and sunken. In temperate areas such as the U.S. mainland, a rapid blight also occurs over portions of the plant during periods of high moisture. Leaves and pods are covered with fungal threads known as web blights. These web blights are less common in Hawaii.