Root Rot of Hydroponically Grown Cucumbers Caused by Zoospore-Producing Isolates of Pythium intermedium. M. E. Stanghellini, Professor, Department of Plant Pathology, University of Arizona, Tucson 85721. J. G. White, J. A. Tomlinson, and C. Clay. Research Plant Pathologist, Senior Virologist, and Electron Microscopist, National Vegetable Research Station, Wellesbourne, Warwick, England CV35 9EF. Plant Dis. 72:358-359. Accepted for publication 16 November 1987. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0358.

Pythium intermedium is reported for the first time as a root pathogen of hydroponically grown cucumbers. Catenulate and deciduous sporangia were capable of direct (formation of germ tubes) and indirect (formation of zoospores) germination.