Diversity of Vegetative Compatibility Groups of Cryphonectria parasitica in Connecticut and Europe. S. L. Anagnostakis, Plant Pathology and Ecology, Connecticut Agricultural Experiment Station, New Haven 06504. B. Hau and J. Kranz, Tropeninstitut, Justus-Liebig-Universität, Schottstrasse 2-4, 6300 Giessen, West Germany. Plant Dis. 70:536-538. Accepted for publication 15 January 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-536.

Strains of the chestnut blight fungus (Cryphonectria parasitica) were isolated from natural cankers in Connecticut and compared with strains isolated in France and Italy for vegetative compatibility (v-c) type. When American and European populations were compared using diversity indices, less v-c diversity was found among European than among Connecticut C. parasitica.