These small flies have dark colored bodies and are about 1/8 inch in length, making proper identification difficult without magnification. The tarsi (last 5 segments of the hind leg) is the key to identifying the Sphaerocerid fly. On this particular fly, the first segment of the tarsi is greatly enlarged.
The Sphaerocerid fly belongs to a large family of flies known as Sphaeroceridae which contains 241 species in North America. Most flies of this family generally breed in animal manure and can also be known as small dung flies. There are a few species that feed in any decaying organic matter, meaning that they can be found in the same areas as Phorid flies and Fruit flies. The life history is much the same as these other small flies.
When searching for Sphaerocerid fly breeding sources, remember that the larva can only survive in decaying organic matter that is moist. The first obvious place to check is where any fruits or vegetables or stored outside of refrigerators or coolers. Other areas to inspect would be dumpsters, recycling bins, seldom used (or cleaned) garbage cans, underneath and behind large appliances. Do not overlook drains where small flies are often found breeding in the super thin layer or film of debris that naturally accumulates in pipes, traps and drains.
In commercial and residential structures, tiny amounts of organic debris are
often found where the legs or feet of appliances, tables or cabinets touch the floor.
These tiny spaces can harbor thousands of fly larvae. All small cracks and
crevices at floor level need to be inspected and thoroughly cleaned. Floor and sink
drains can then be treated with Invade
Bio Drain Gel.
Once one source has been located, continue with your inspection. Sphaerocerid flies easily follow air currents and usually have several breeding places in any structure. Do not assume that all of your breeding sources are indoors; Sphaerocerid flies will wander in from nearby dumpsters, outdoor garbage cans or even damp compost piles where fruits and vegetables are disposed.
As in any Small Fly elimination program, identifying and eliminating all possible breeding sites is the key to success.
In a few isolated cases (where moisture was an on-going problem) Talstar or Bifen IT liquid concentrate has been used to spray the soil in crawl spaces beneath older buildings. Talstar gave immediate and long term (2 months) control in killing flies and fly larvae.
Although there are several sprays and traps used to kill flies in
a home, restaurant or other structure, the infestation cannot be eliminated without
eliminating their source.
6920 Pine Forest Road