Jun 13, 2014 - 09:42 AM
Thi type trap is made of cardboard and paper. It can work well for picnics, but if you have food around, I have found that no trap will attract flies away from REAL food. However, I welcome you to give it a try and see what happens. They are inexpensive enough, and if they don't work, you can always use them in your garage or home.
We use them in our offices and they work great for gnats and houseflies