Something is eating all the leaves of my honeydew melon, zucchini, pumpkin, watermelon and cucumber plants. The leaves disappear down to the stem. They go from perfectly healthy green leaves to gone. I check the garden every morning and afternoon and each time I check more have disappeared. I don't see any slimy substance from snails or slugs. I haven't found any caterpillars yet. I was thinking possible vine borers but I don’t see any saw dust stuff on the ground and the leaves are not turning yellow before diapering. Basically full leaves are disappearing all together and they are going fast. No leaves have been found on the ground. I need to solve this quickly. I’m in south Florida. Does anyone know what it could be? And how can I fix this problem. Help please!

Jeff