Flies

Common Housefly “Musca domestica”

Common Housefly

Wing span 10mm. Body length 6mm to 8mm, They are greyish with pale strips on the thorax. And have two big red eyes, The Housefly is very common worldwide, frequently found in association with man either indoors or taking advantage of another human activity. It is found where ever there are suitable breeding conditions, which is usually rotting, fermenting or at least moist organic matter, of high protein. The female Housefly can lay up to 750 eggs in batches of 150 on rotting materials or animal faeces. The larvae hatch within 8 – 48 hours, and they quickly burrow into the food stuff away from the light. They are white in colour, then change to a cream as they grow. The small maggots can develop quite rapid depending on the quality of the food stuff. If the temperature is high and the quality of the food stuff is of high protein, then the entire larvae cycle may only take 5 days to develop. The larvae will reach 12mm in length, be a creamy or yellowish white colour, and have a distinctive carrot shape.

The mature larvae seeks out a drier site, where it then buries itself ready for pupation. The last skin is cast, which changes the shape a little and forms a smooth ovoid, which gradually darkens, or even goes black. The adult fly emerges a few days later. Common Houseflies are regarded as one of the most important public health pests and are potential vectors for a wide range of diseases, Including, dysentery, gastroenteritis, typhoid and cholera as well as being hosts to intestinal parasitic worms. Flies are only able to ingest liquid food, and the way that they achieve this when landing on solid food. Is by regurgitating their gut contents with a large amount of saliva. That mixture contains digestive enzymes, and remains of their last meal. This liquefies the solid food which they then horde it together, with their forelegs and suck up. Bacteria or any other disease organisms both in the gut and the outside of the fly are also left behind.

The Lesser Housefly “Fannia canicularis”

The Lesser Housefly

 

It is slightly smaller then the Common Housefly, the body only being 5mm to 6mm in length and a little bit more slender. These to also have a grey thorax and 3 vague longitudinal stripes. But have a division between the eyes which is white.In the summer they tend to come in to your house looking for shade, they are normally found in the centre of rooms. Doing a characteristic flight pattern. They fly in a straight line for 20-30cm, when they suddenly turn and fly and fly in Straight line again, repeating the same flight pattern over and over again. When two flies meet they have a mad scuffle for a few seconds, and then continue with their flight. The female Lesser Housefly can lay between 250 to 350 eggs, in batches of 50. The larvae will hatch within 48 hours, and it is brown in colour. As with the Common Housefly pupation takes place in the drier areas of the breeding site. The adult Lesser Housefly usually emerges in less then a fortnight, they mate, separate. But the female stays to lay more eggs.

Other fly species

  • The Cluster Fly. ( Pollenia rudis ) Usually no problem during the summer months. They come in doors to hibernate during winter and can form vast clustering masses in roof spaces or attics.

  • Stable Fly. ( Stomoxys calcitrans ) A blood sucking fly, a pest of rural areas where domestic animals are found, cattle sheds, stables etc.

  • Blowflies. Blue bottles & Green bottles. ( Calliphora vomitoria & Lucilia spp ) Noisy flies, which are attracted to dead meat. Green bottles can be a problem to farmers with sheep.

  • Flesh Fly. ( Sarcophaga spp ) Seldom found indoors, but may be seen around dustbins in the summers months, especially if meat carcasses have be thrown away.

  • Fruit Fly. ( Drosphila spp ) Very small with large bright red eyes. Mainly found outdoors feeding on the sap of trees, rotting fruit on the ground. Can come indoors.

The Cluster Fly Stable Fly Blue bottles Green Bottle Flesh Fly
The Cluster Fly Stable Fly Blue bottles Green Bottle Flesh Fly

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