Disease Gallery

Name: Liver Spot

Latin Name: Gnomonia carvae

Description: Liver spot can cause severe defoliation, particularly during prolonged periods of wet weather. Weak trees are more susceptible to liver spot than are healthy trees. This disease sometimes causes defoliation in the more humid southeastern states but is not considered a serious disease in Oklahoma.

Disease Life Cycle: The first sign of the disease appears in May and June. Black pycnidia form in the lesions in late summer.

Disease Symptons: Circular, dark brown spots appear along the midrib on the lower surface of the leaves. In late summer the spots turn a cinnamon brown or liver color. Liver spot is characterized by the appearance of reddish brown (liver colored) circular spots one-eighth to five-eighths inch in diameter on the lower side of leaflets. In the fall, the spots turn cinnamon brown and contain small, dark fungal-fruiting bodies.