Early signs of infection by this disease are water-soaked spots on the leaves and fruit. Leaf spots develop into brown, papery necrotic lesions that have lighter centers. Spots on fruit develop into sunken pits.
The disease organism survives in infected fields in crop residue, so crop rotation is important. Several genetically resistant varieties of cucumber and watermelon are available. A preventative spray program may be required for effective control.
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Publication Revised July 2009