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Physiological Specialization in Tranzschelia discolor. H. A. Bolkan, Plant Pathologist, Campbell Institute for Research and Technology, Route 1, Box 1314, Davis, CA 95616. J. M. Ogawa, Professor, and T. J. Michailides, Postgraduate Research Assistant, Department of Plant Pathology, University of California, Davis 95616; and P. F. Kable, Principal Research Scientist, Biological and Chemical Research Institute, Private Mail Bag No. 10, Rydalmere, N.S.W. 2116, Australia. Plant Dis. 69:485-486. Accepted for publication 17 December 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-485.

Results of inoculation trials conducted under greenhouse conditions in California and in New South Wales, Australia, demonstrated specialized parasitism by various isolates of Tranzschelia discolor. The names T. discolor f. sp. dulcis for strains that attack almond, T. discolor f. sp. persicae for strains that attack peaches, and T. discolor f. sp. domesticae for strains that attack prunes are proposed.