Catch them in four different easy-to-make traps.
Got an infestation? Control it right now!
I compare the effectiveness of four different types of traps.
Step 1: Inverted Cone Fly Trap
To make it, cut off the top of a soda bottle and insert it into the remaining part inverted. Tape or hotglue it in place. Put some liquid bait in the bottom.
The flies will fly in and will follow the walls back up, not finding the way out.
Instead of the plastic cone some people use a paper cone,
a plastic bag with the corner cut off,
or a piece of saran wrap with a small hole in it.
some people use these Alternative Baits:
juice or sugar water'
sugar water with yeast
apple cider vinegar
for other types of flies: meat, fish, canned cat food, or whatever the flies seem to like.
Step 2: Soap Bubble Trap
I used red wine as bait and added some dish soap. Put your hand over the top and shake it up as shown to make the bubbles. Then put it near your infestation.
Step 3: Soapy Bait Trap
Put a dab of soap on your fingertip and touch that to the surface of your liquid bait.
The soap breaks the surface tension and the flies fall into the liquid when they touch it.