Pathogenicity of an Isolate of Verticillium dahliae from Barley

A fungus isolated from leaves of barley was determined to be Verticillium dahliae. Its pathogenicity was compared with that of known isolates of this fungus from tomatoes, cotton, and potatoes, and with members of various vegetative compatibility groups. Among small grain cereals, oats and barley were susceptible. Wheat was infected but did not develop severe symptoms. Wounding of roots facilitated infection, but was not required. (…)