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Distribution of Mating Types of Phytophthora palmivora. G. A. Zentmyer, Department of Plant Pathology, University of California, Riverside 92502; D. J. Mitchell(2), Laura Jefferson(3), J. Roheim(4), and D. Carnes(5). (2)(3)(4)(5)Department of Plant Pathology, University of California, Riverside 92502, (2)Present address: University of Florida, Gainesville 32601. Phytopathology 63:663-667. Accepted for publication 8 December 1972. DOI: 10.1094/Phyto-63-663.

Mating type was determined for 206 isolates of Phytophthora palmivora; 116 were A2, 80 were A1, and ten did not form oospores with either test strain. These data were combined with previous records of intraspecific crosses in P. palmivora to give for the first time a world-wide summation of the geographical distribution of the two mating types and of their host relationships. Both types occur in Brazil, Cameroun, Ceylon, Costa Rica, Gabon, Ghana, India, Ivory Coast, Jamaica, Malaya, Mexico, Nigeria, Puerto Rico, Rhodesia, Sarawak, and the United States (Hawaii). New records are included of A1 and A2 types in a number of countries.