UK Plant Pathology Extension Seeks Information on Watermelon Anthracnose
From Purdue Extension:
Anthracnose of cucumber, muskmelon, and watermelon affects all the aboveground parts of these crops. In cases where infection is high and lesions on the leaves are numerous, vine defoliation may occur and result in yield loss or lower quality fruit. Direct infection
of the fruit also can result in loss of marketability. This publication describes the disease cycle and symptoms of anthracnose and offers management recommendations.