Target spot is caused by the sexual stage of the soil-borne fungus, Rhizoctonia solani. Symptoms begin as small, water-soaked lesions on foliage. (Photo: Kenneth Seebold, UK)

Initial spots become tan in color and expand in size. (Photo: Kenneth Seebold, UK)

Concentric circles within the spots give them a target-like appearance, thus the name. (Photo: Kenneth Seebold, UK)

Centers of older lesions may crack and drop out. (Photo: Kenneth Seebold, UK)

Spores of the pathogen are carried to other transplants by air currents. (Photo: Kenneth Seebold, UK)