Biology
Angular leaf spot is a bacterial disease which can affect cucumber and many related species. Leaves initially develop small, water-soaked spots which enlarge until limited by the larger veins. The lesions are typically angular in shape rather than round. The spot may exude clear or milky droplets of bacterial ooze on the underside of the leaf. The droplets dry to a whitish, crusty layer. Leaf lesions often turn tan and tear away from the leaf, leaving ragged, irregular holes. Spots also appear on stems, vines, and fruit. Lesions on fruits are typically small, circular, water-soaked spots. These spots may be associated with an internal fruit rot. The bacteria are spread by splashing water, insects, and mechanical means including hands and tools.
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