Biological Process Development Facility


Date of this Version


Document Type



Plant Disease 66 (1982), pp. 76-79.


Copyright 1982 American Phytopathological Society


Bacterial mosaic is a foliar disease of wheat; characteristic symptoms are small yellow lesions, more or less uniformly distributed over the leaf. It was discovered in Nebraska in the spring of 1976. By 1979, the pathogen was distributed over an 800-km range and had been isolated from 16 cultivars of winter wheat. The pathogen is Corynebacterium michiganense subsp. tessellarius, a Gram-positive coryneform. Wheat was the only host that showed symptoms after inoculation. The pathogen reached high population levels (> 10' colony-forming units per gram of fresh weight) without apparent symptoms in tomato and in six of nine gramineous plants in greenhouse tests.