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Water-soaked lesions between the veins of leaves are a telltale symptom of this bacterial disease, which infects cucumbers, summer squash, and melons. Symptoms often first appear on the underside of leaves. As infected areas in the leaf die, the tissue becomes brittle and those leaf parts fall away, giving afflicted leaves a ragged appearance. Angular leaf spot lesions may exude a milky fluid that dries on leaf surfaces. In severe outbreaks, lesions may also develop on stems and fruit.
The bacterium overwinters in the soil on seeds and plant residues, and is spread by rain splash and wind. Angular leaf spot is especially prevalent in warm, humid climates.
Last updated: 7/12/19
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