Angular leaf spot of cucumber caused by Pseudomonas syringae pv. lachrymans in Kurdistan

Angular leaf spot of cucumber caused by Pseudomonas syringae pv. lachrymans in Kurdistan

2007

A:PS

During the spring seasons of 2004 and 2005, angular leaf spot was observed on cucumber (Cucumis sativus) in some areas of Kurdistan Province in Iran for the first time. Disease incidence in affected fields was approximately 100%. Symptoms were initially small, round or irregular, water-soaked spots on leaves ranging from 3 to 5 mm in diameter. These spots were limited by the leaf veins that gave them an angular appearance. Under humid conditions, tiny, white exudates formed on the undersides of the leaves and severely infected leaves turned yellow. A fluorescent pseudomonad was consistently isolated from lesions on King's B medium. Isolates were identified as Pseudomonas syringae pv. lachrymans on the basis of phenotypic, biochemical and physiological properties.

v.91(6):769, PLANT DISEASE

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