Evaluating Cucurbit Seedling Resistance to Phytophthora drechsleri. B. Mansoori, Former Graduate Student, Department of Plant Protection, College of Agriculture, University of Shiraz, Shiraz, Iran. Z. Banihashemi, Professor, Department of Plant Protection, College of Agriculture, University of Shiraz, Shiraz, Iran. Plant Dis. 66:373-376. Accepted for publication 15 June 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-373.

Large numbers of similar-aged zoospores were obtained from Phytophthora drechsleri. A total of 116 cultivars of Cucumis melo (cantaloupe and long melon), C. sativus (cucumber), Cucurbita pepo (squash), and Citrullus lanatus (watermelon) were inoculated with zoospores at 30 C. Cultivars differed in susceptibility, with Cucumis melo cultivars the most susceptible and Cucurbita pepo cultivars the most resistant. Cucumber cultivar Ohio MR 17 and a local cultivar from Iran, watermelon cultivar Klondike No. 7, and cantaloupe cultivar Gold & Silver were highly resistant to P. drechsleri.

Keyword(s): cucurbit root rot and damping-off, soil extract.