Powdery mildew, mosaic viruses, angular leaf spot and other fungal and bacterial diseases.
Pick cantalope when the stem separates easily from the melon. For netted melon varieties, the skin between the netting will turn from green to yellow at ripeness. Honeydews will soften slightly on the flower end of the fruit when ripe, along with a slight change in fruit color. Check the belly of watermelons for the best indicator of ripeness. The belly turns from greenish white to buttery yellow or cream at maturity. This change is most noticeable on watermelons with dark green skin.