Drain Fly

 Identification and Control

Proper identification is an important first step in controlling ants.

Psychoda phalaenoides

How to Identify an 

Drain Fly

Drain flies are small (1/8 inch long), black, and have a fuzzy appearance. They often fly in swarms and are most easily identified by their small size and their fuzzy appearance.

Where do they come from?

Drain flies are common in the United States and Canada. They are most often found near drains or other sources of food. Drain flies can also be brought into your home on food or garbage.

How to keep them out

The best way to get rid of drain flies is to eliminate their food sources by thoroughly cleaning your kitchen and bathroom. You can also use commercial fly traps or bait. If you have a severe infestation, you may need to call a professional exterminator.

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What do they look like?

Note the very hairy body and wings of the drain fly
Countless hairs cover the drain fly
Wing venation is a key way to ID a drain fly

Where do they live?

Drain flies lay their eggs in scum lining drains and sewer lines or in decaying organic material. Larvae hide behind this scum.


Psychoda phalaenoides




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