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Resistance

Field Protection of Cucumber, Watermelon, and Muskmelon Against Colletotrichum lagenarium by Colletotrichum lagenarium. F. L. Caruso, Graduate Student, Department of Plant Pathology, University of Kentucky, Lexington, KY 40506; J. Ku?, Professor, Department of Plant Pathology, University of Kentucky, Lexington, KY 40506. Phytopathology 67:1290-1292. Accepted for publication 18 March 1977. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-1290.

In three separate field trials, cucumber plants were partially protected against a challenge inoculation with Colletotrichum lagenarium by a prior inoculation with the pathogen. Protection of watermelon was evident in two trials and indications were that muskmelon also could be protected. Lesions produced on protected plants were reduced in number and size compared to those produced on unprotected plants. This protection phenomenon seems to be expressed in the field as well as in the greenhouse.

Additional keywords: biological control, immunization.