Angular leaf spot is a severe disease most common on cucumbers. Disease symptoms first appear as water-soaked lesions on underneath surface of leaves that occur between the minor veins of the leaves. These lesions may exude a whitish-liquid under some conditions. As the disease progresses, the infected spots turn brown and the leaf material falls out, leaving angular holes in the leaves.
Fungicide sprayed at first symptom appearance is helpful. Handling infected plants during harvesting quickly spreads the disease. Crop rotations with at least 2 years between crops are important. Use seeds free of the disease organism and plant resistant varieties where available.
See also The Texas Plant Disease Handbook.
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Publication Revised July 2009