Root Diseases of Vegetables in Hydroponic Culture Systems in North Carolina Greenhouses. S. F. Jenkins, Jr., Professor of Plant Pathology, North Carolina State University, Raleigh 27650. C. W. Averre, Professor of Plant Pathology, North Carolina State University, Raleigh 27650. Plant Dis. 67:968-970. Accepted for publication 2 March 1983. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-968.

Pythium aphanidermatum, P. myriotylum, P. debaryanum, and P. ultimum were isolated from roots of diseased tomato, cucumber, and lettuce growing in greenhouse hydroponic systems. Colletotrichum coccodes was isolated from roots of diseased tomato, and Pseudomonas solanacearum, Fusarium oxysporum f. sp. radicis-lycopersici, and Erwinia spp. were isolated from stems near the base of diseased tomato plants. F. oxysporum f. sp. cucumerinum was isolated from stems of infected cucumber plants. All isolates were pathogenic on the host from which they were isolated. The four Pythium species, C. coccodes, Pseudomonas solanacearum, and F. oxysporum f. sp. cucumerinum were readily transmitted in the nutrient solutions of hydroponic systems. Erwinia spp. and F. oxysporum f. sp. radicis-lycopersici were not transmitted in the hydroponic system.

Keyword(s): nutrient film technique.