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A Technique to Evaluate Tomatoes for Resistance to Phytophthora Root Rot in the Greenhouse. H. A. Bolkan, Plant Pathologist, Campbell Institute for Research and Technology, Route 1, Box 1314, Davis, CA 95616. Plant Dis. 69:708-709. Accepted for publication 22 January 1985. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-708.

Tomato seedlings were grown in speedling trays and inoculated with a zoospore suspension at the first-leaf stage. Percent stand and root rot severity 7 days after inoculation was used to compare genotypes. The amount of seedling resistance was positively correlated with the degree of Phytophthora root rot in the field.