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A Modified Selective Medium for Detecting Phytophthora cinnamomi on Avocado Roots. Z. Solel, Department of Plant Pathology, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel; Y. Pinkas, Department of Plant Pathology, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel. Phytopathology 74:506-508. Accepted for publication 6 January 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/Phyto-74-506.

Isolation of Phytophthora cinnamomi from avocado roots on Phytophthora-selective media P₁₀VPH and PARPH was accompanied by the development of oomycetous contaminants which interfered with detection of the pathogen. Addition of iprodione to the media markedly inhibited the growth of the contaminants and Pythium proliferum. This weak pathogen of avocado was shown to be insensitive to hymexazol. More avocado seedlings were found to be infected with P. cinnamomi when iprodione-amended PARP medium was used.