I put a bunch of water melon rines on my compost pile RED side down. The compost was about 4 1/2 ft tall. The water melon rines made holes all the way to the bottom of the compost pile as if they had burned a hole or melted a hole all the way to the ground. I put left overs from a whole water melon on there and it pretty much ate up the 75% of the compost pile in only a few days. I turned the water melon rines over to look on the bottom side and it is covered with Black Solder Fly magets. COOL
Alright this is exactly what I have been looking for, a way to attract black solder flies. It appears I can do a years worth of composting is about a week. The maggets ate up the grass clippings I assume because they were touching the red side of the water melon. Looks like the maggets are going after the sweet part of the water melon and eat the grass clipping and other stuff in the process.
The organic material that the maggets have eaten looks like a cow pile.
I'm not 100% sure but if black solder flies like sweet then sugar water sprayed on the compost pile might be the trick to get the magets to eat the whole rest of my compost pile.