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Ecology and Epidemiology

Dispersal of Phytophthora cinnamomi on the Island of Hawaii. J. T. Kliejunas, Assistant Professor, Department of Plant Pathology, University of Hawaii, Beaumont Agricultural Research Center, Hilo 96720; W. H. Ko, Associate Professor, Department of Plant Pathology, University of Hawaii, Beaumont Agricultural Research Center, Hilo 96720. Phytopathology 66:457-460. Accepted for publication 30 September 1975. DOI: 10.1094/Phyto-66-457.

Phytophthora cinnamomi was recovered by lupine baiting from soil particles carried on boots of humans, tires of vehicles, and hoofs of feral pigs. It existed in soil as chlamydospores and unknown propagules in organic matter. Zoospores of P. cinnamomi that were released when soil was submerged in water were dispersed by rain splash or runoff water. The fungus was trapped by lupine from streams and recovered from dead ohia leaves on the forest floor. It was isolated from the roots of 20 endemic, two indigenous, and five introduced plant species in 22 plant families. All isolates tested were of the A² mating type.