Variation in Pathogenicity and Cultural Characteristics of Sorghum Isolates of Colletotrichum graminicola in India. S. Pande, Cereals Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India. L. K. Mughogho, R. Bandyopadhyay, and R. I. Karunakar. Cereals Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India. Plant Dis. 75:778-783. Accepted for publication 3 January 1991. Copyright 1991 The American Phytopathological Society. DOI: 10.1094/PD-75-0778.

The pathogenicity of nine sorghum isolates of Colletotrichum graminicola from different locations in India was tested on 30 sorghum genotypes in the greenhouse. Based on reaction class and disease severity, six genotypes were identified as susceptible and seven as resistant to all nine isolates of the pathogen. The remaining 17 genotypes exhibited differential responses to the nine isolates. The isolates also varied in their cultural characteristics. These results indicated that the nine isolates were distinct physiologic races.

Keyword(s): leaf anthracnose, Sorghum bicolor.