Diptera includes mosquitoes and flies. They have only one pair of functional wings.
The life cycles of Diptera vary among different groups. Many feed as larvae on decaying organic matter or fungi. Aquatic larvae are found primarily among mosquitoes. Some fly larvae are found on carcasses or in decaying plant material. Some dipterans are parasites of vertebrates. Others are parasites of insects. Still others cause significant damage to various plants. There are approximately 5,900 species in Sweden.
Common Flies in Sweden
Fruit flies, vinegar flies, and banana flies are primarily attracted to and develop in overripe and fermented fruits and vegetables, as well as other organic material that is fermenting.
Fruit flies are actually a type of blowfly but resemble a large housefly more closely. The cellar fly is not a sign of poor hygiene, poses no health risk, and, most importantly, does not breed indoors.
Grass flies are often called house flies and frequently appear in large numbers, which can be a nuisance.
Moth flies can be found just about anywhere there is moisture; they are common in indoor drains and floor drains.
Humpback flies are another type of fly that develops in moist organic material that is decomposing.
Tips for avoiding problems with mosquitoes and flies
Whenever mosquitoes and flies are found indoors, it’s important to locate the area where they are breeding and then clean or dispose of the area or material where the insects are found. It’s important to keep in mind that any organic material that remains damp for an extended period of time can become a breeding ground for flies and mosquitoes.
It’s almost impossible to keep flies from getting in; they seek shelter when it gets colder—Install insect screens on vents and along the eaves, and seal around windows, cable penetrations, etc.
Flies are easy to get rid of—use a vacuum cleaner.
Be sure to dispose of fruit waste in sealed bags and keep the fruit in the bowl free of overripe, rotting fruit. Don’t stack bags of packed fruit—the ones at the bottom will ooze juice and rot. Instead, lay them out on a flat, dry surface.
Never throw fruit scraps into a trash can that is emptied infrequently.
Try mixing 2 parts vinegar, 1 part syrup, and 1 drop of dish soap (ammonia-free) in a small bottle or similar container. The mixture attracts fruit flies, which fall into the bottle and get trapped there.
(source: Anticimex)