Abstract
Five bacterial isolates were evaluated for their ability to reduce root rot caused by Pythium aphanidermatum (Pa) on cucumber (Cucumis sativus L. cv. Corona) grown under simulated commercial conditions in a rock wool hydroponic system. Two isolates of Pseudomonas corrugata (Pc13 and Pc35) and three of Pseudomonas fluorescens (Pf15, Pf16, and Pf27) were evaluated in both spring and early fall 1991 crops. Isolates Pc13, Pc35, and Pf15 were also evaluated in a 1992 spring crop. In all crops, 5-wk-old plants were set onto rock wool slabs and treated with water or 200 ml of a bacterial suspension (10 6 cells per milliliter)
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