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Protection of Cucumber against Colletotrichum lagenarium and Cladosporium cucumerinum. R. Hammerschmidt, Department of Botany and Plant Pathology, Purdue University, W. Lafayette, Indiana 47907; S. Acres(2), and J. Ku? (3). (2)2529 North B, Elwood, Indiana 46036; (3)Department of Plant Pathology, University of Kentucky, Lexington 40506. Phytopathology 66:790-793. Accepted for publication 16 December 1975. DOI: 10.1094/Phyto-66-790.

Cucumber cultivars resistant to Cladosporium cucumerinum, when inoculated with C. cucumerinum, were protected against disease from subsequent inoculation with Colletotrichum lagenarium. Cucumber plants susceptible to C. cucumerinum, when inoculated with Colletotrichum lindemuthianum, were protected against disease from subsequent inoculation with C. cucumerinum. Cladosporium cucumerinum and C. lagenarium are pathogens of cucumber, whereas C. lindemuthianum is a pathogen of bean. Effective mechanisms for disease resistance to a pathogen may exist in apparently susceptible cultivars.

Additional keywords: induced resistance, cucumber, anthracnose.