2. After this, in the evening (this is important because drain flies are most active during night), place a piece of clear tape over the drain outlets, pipes etc. in your kitchen and bathroom, place the tape with the sticky side facing downwards. Do not completely cover the drain with tape, as this will prevent flies from coming out of the drain.
3. Leave the tape overnight or a weekend if possible. After that, check the tape, if you find any flies sticking to the tape, you have found the breeding source. If not, then repeat the test for 4 more nights to account for differences in the breeding cycle.
Now let’s see how to control the growth of drain flies.