I have had to deal with fruit flies at a restaurant that i worked at, We had large amount of fruit and sweats that they were attracted to. Have some cups covered with plastic wrap on the top and take a pen to make wholes in the middle, fill the cups with wine, vinegar, or OJ to attract them.


This method is ok at best, it really worked best in conjunction with this citrus goo stuff that we poured down the drains in the entire restaurant for months. Apparently they love to lay their eggs in damp, dark, and humid places like the drains by the dishwasher. Your tubs are probably an ideal spot to lay eggs and they are finding food somewhere else, i would look into the goo stuff i was mentioning but i have a feeling using it on your cages wouldn't be too practical or efficient.