Characteristics
Phorid flies, also known as humpbacked flies, are small and
resemble fruit flies in appearance. The Phorid fly lacks the red eye
color that is the classic trademark of the fruit fly. Phorid flies are in
the small category of flies, measuring up to 1/8 inch in length, including
the wings. Color: Tan brown with black eyes; small
head; a severely arched (humpbacked) thorax when viewed from the side.
Behavior
The most easily recognized feature (seen with the naked eye) is the habit
of the adult Phorid fly running rapidly across surfaces instead of
immediately flying when disturbed. Most flies immediately take flight.
Phorid flies are common in homes and commercial facilities where food is
prepared and served, but they are also a key pest in food
warehouses, and hospitals. Because these flies frequent unsanitary
conditions, they are a potential health concern when they occur in food
facilities and hospitals.
Phorid fly larvae have been
found
in the open wounds of patients in nursing homes and hospitals.
Habitat
Phorid flies are capable in breeding in more types of materials than any
other structure-infesting flies. The reproductive
potential of these flies is tremendous and very large numbers of them may
appear in a short time. Adult flies are strong fliers, having
been known to travel as far as 6 miles within a 24 hour period. Phorid
flies are found throughout the world.
In nature, they are typically associated with dead animals and heavily
decaying vegetation. In buildings, they be may found breeding in drains,
trash containers, dumpsters, rotting produce, recycle bins, grease traps,
garbage disposals, crawlspaces, and any site where moist organic matter
can accumulate for a few days or longer.
Control
The key to
controlling Phorid fly infestations is to locate and eliminate their
breeding sources. 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. If you locate a
drain that is a breeding ground for Phorid flies, use
a foaming drain cleaner
to destroy the film in which the fly eggs and larvae are developing. A
surface spray is not recommended in this situation, unless there are great
numbers of flies resting on the surface of trash cans, dumpsters or
exterior walls.
Many pest professionals have
foam generators that will fill drain pipes coating all surfaces for
effective Phorid fly control.
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