Physiological and biochemical studies on phytopathogenic bacteria isolated from cucumber in Egypt

Thirty phytopathogenic bacterial isolates were obtained from diseased cucumber plants [Cucumis sativus]. These isolates were highly pathogenic, capable of inducing angular leaf spots as well as wilting of cucumber seedlings within 3-6 days after inoculation. The diagnostic tests including colony morphology, pathogenicity trials and different physiological tests showed that they belonged to Pseudomonas syringae pv lachrymans. Inoculating three weeks old cucumber seedlings with the most virulent isolate resulted in a reduction in dry weight, water content and both shoot and root length to a level below that of the control