Cluster Fly
Description
At about 9mm lang, the cluster fly is slightly larger than the common house fly. The thorax is dark olive grey, with fine golden hairs which can easily be rubbed off. There are no distinct lines or stripes behind the head and the abdomen has irregular light and dark grey areas.
Biology
The female lays eggs in the soil near the burrows of earthworms. The tiny maggots that hatch from the eggs seek out earthwarms to feed upon. As cold weather progresses, adults seek protected places to spend the winter, particularly during September and October (activity can often be noted again in early spring). In many coses the flies seek shelter within walls, roof voids and attics, usually returning to the same building year after year and often favouring south facing buildings.
Fruit Flies
Description
The adult flies are very small insects, about 3mm long. Body colour is usually a light yellow to tan colour and the abdomen is grey underneath. A common characteristic of the flies is distinctive red eyes.
Biology
Female fruit flies lay their eggs on the surface of rotting fruit, fermentng juices, soured milk etc. Fruit fly larvae feed an the yeast organisms and fungi growing in the fruit and vegetable materials. Through their feeding efforts, they soon turn their food into a semi-liquid mess and given their biology, they are a common pest in pubs and commercial kitchens
Filter Flies
Description
Adults: 2mm, wings are almond shaped and the flies are very hairy. They are frequency mistaken for small moths once the wings are held roof-like over the body when at rest. They are weak fliers and often appear to be jumping or hopping.
Biology
Filter flies are often associated with moist, highly organic areas such as sink drains, sewage treatment facilities, storm drains, dung and rotten vegetation. Each female can produce about 100 eggs and, under optimum conditions, development can be completed in two weeks.
Treatment
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