Drain flies measure about 1.5 to 5 mm long, have a tan to light gray body and light colored wings. The body and wings of a drain fly are covered with tiny long hairs.
Adults are commonly found around the kitchen, bathroom, and laundry room or basement if drains are present in the rooms and are more active at night. Drain flies do not bite and do not transmit human diseases even though they feed and breed in filth.
Drain flies lay their eggs in irregular masses and just about any where decomposing organic material is found. Homeowners typically won’t ever see drain fly larvae as they are inside the drain in a gelatin like film. These flies generally complete one generation in two to three weeks, but if the conditions are just right and in their favor it can be as soon as one week.
Signs of drain flies and what to do:
The most common and noticeable sign of drain flies are actually seeing the adults. They may be seen resting on the walls or fairly close to the breeding material, which is in the drain. You may also notice larvae as well perhaps at the bottom of a sink or near the drain but this is less common.
The best way to achieve control on drain flies is removal of the breeding site. Remember they breed in the organic material that collects in the drain, basically drain gunk. If you are noticing these small hairy flies in you home, it is almost certain that there is a slow draining or clogged drain. You will need to figure which drain they are coming from and physically clean it. This is not a job for liquid drainer, which may still leave the drain lined with gunk. Use hot water and a small bristled brush to help remove the gunk material, you may see drain fly larvae at this time. After the gunk material and larvae are remove, the problem is solved. The only thing left is the adult drain flies. If you decide not to swat them, they may live up to 20 days but will soon die since they will not have a place to lay eggs.
Cleaning out the drains is a fairly simple task and usually does not require a pest professional. If you are having reoccurring infestations then you need to call your pest professional for some additional investigating and advise on treatment.
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