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Distribution of the A1 Mating Type of Phytophthora cinnamomi. G. A. Zentmyer, Professor of Plant Pathology, University of California, Riverside, CA 92502; Phytopathology 66:701-703. Accepted for publication 12 November 1975. DOI: 10.1094/Phyto-66-701.

Our isolations and reports in the literature show that the A1 compatibility or mating type of Phytophthora cinnamomi has a more limited distribution, both geographically and by host, than the A2 type. The A1 type has been reported from Australia, Malagasy Republic (Madagascar), Papua New Guinea, South Africa, and the United States; the host list for the A1 type includes only 11 plants in 10 genera. The A2 type is world-wide in distribution, and has several hundred hosts. Most of the A1 isolates resemble the type culture in cultural appearance, although some vary considerably phenotypically and in growth rate.

Additional keywords: compatibility type, hosts of A1 type.