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Pest Library: Drain Flies

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Drain flies are about 1/16 of an inch in length with light-tan bodies covered with long dense hair. The larvae are aquatic and are long and cylindrical with dark, hardened patches on the back of each segment. They breathe through a hardened stalk-like siphon tube at the end of their bodies. Drain flies become a problem in homes and restaurants. They can be found breeding in liquids found in drains, stagnant water under appliances, garbage containers, and so forth. They are poor fliers and generally will be found in greater numbers near the source of the infestation. Females lay 20 to 100 eggs in suitable breeding material which will hatch in about two days. The larvae feed on algae, bacteria sludge and fungi.

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