Fruit Rot of Guava Caused by Phytophthora citricola. W. H. Ko, Professor, Department of Plant Pathology, University of Hawaii, Beaumont Agricultural Research Center, Hilo 96720. R. K. Kunimoto, Research Associate, and W. T. Nishijima, Assistant Extension Plant Pathologist, Department of Plant Pathology, University of Hawaii, Beaumont Agricultural Research Center, Hilo 96720. Plant Dis. 66:854-855. Accepted for publication 1 March 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-854.

Grayish brown fruit rot of guava at Waiakea-Uka on the island of Hawaii was found to be caused by Phytophthora citricola. Mature fruit appeared to be less susceptible to the pathogen than mature green or green fruit. The pathogen, which produced oospores by self-induction, was capable of inducing oospore formation of A¹ but not A² mating type of Phytophthora parasitica.

Keyword(s): host range, primitive parasite, Psidium guajava.