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Etiology

Systemic Invasion of Cucumber by Pseudomonas lachrymans. Ken Pohronezny, University Fellow, Department of Plant Pathology, The Ohio State University, Columbus, OH 43210; Curt Leben(2), and P. O. Larsen(3). (2)(3)Professor and Associate Professor, respectively, Department of Plant Pathology, Ohio Agricultural Research and Development Center, Wooster, OH 44691. Phytopathology 67:730-734. Accepted for publication 20 December 1976. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-730.

When hypocotyls of cucumber cultivar National Pickling were inoculated with Pseudomonas lachrymans, causal agent of angular leafspot, the pathogen was recovered from within surface-sterilized sections 10 or more cm above inoculation sites. When P. lachrymans was introduced into second-leaf midvein tissue, it was detected consistently in other parts of the plant, predominantly in sections taken from below the second-leaf node. The pathogen was recovered regularly from within symptomless tissues. Differences were observed in rate and extent of invasion in different cucumber cultivars by different P. lachrymans isolates. More extensive invasion occurred in susceptible cultivars Pickmore and GreenPak than in the field-resistant cultivars H3559 and Premier.

Additional keywords: Cucumis sativus.