I would guess pickleworm is doing the damage. It usually happens on later planted crops.

from the UGA....... Pickleworm This insect is a major (and the most damaging) pest to cucurbits. It is the larvae of a moth that migrates north each year from tropical regions. Female moths lay their eggs on tender buds and new leaves, and sometimes new fruit. The larvae do not emerge until later in the season, developing inside the buds and blossoms. They cause severe late season damage by burrowing into flowers and then tunnel into and through the fruit, causing the fruit to be unmarketable. Larvae are recognized by their pale green/black spotted bodies, which become more of a coppery color as they age .
Control of pickleworm should begin prior to planting by deep plowing, crop rotation, and early planting of crop. Chemical applications have limited effectiveness as larvae are rarely seen. The adult population may be chemically controlled if begun as soon as moths appear. Pheromone lures may be useful in attracting adults, and determining the timing of chemical applications. A few pickleworm resistant varieties are available and should be used where severe problems exist.

Wow, pickleworms...never heard of those! It does match the description. Thanks for the info.

Plant early in Georgia....before they can do you damage.