Fly, (order Diptera), any of a large number of insects characterized by the use of only one pair of wings for flight and the reduction of the second pair of wings to knobs (called halteres) used for balance. The term fly is commonly used for almost any small flying insect . However, in entomologythe name refers specifically to the approximately 125,000 species of dipterans, or “true” flies, which are distributed throughout the world, including the subarctic and high mountains.
Dipterans are known by such common names as gants, midges,mosquitoes,, and leaf miners, in addition to numerous sorts of flies, including the horse fly,house fly,blow fly , and fruit, bee, robber, and crane flies. Many other species of insects are called flies (e.g., dragonflies,caddisflies, and mayflies), but their wing structures serve to distinguish them from true flies. Many species of dipterans are of great importance economically, and some, such as the common housefly and certain mosquitoes, are of importance as disease carriers. See dipteran.
In summer, there are many flies and other flying insects on the farm. There are also large numbers of insects on farms. Insect patches are a nuisance to farming. The most annoying of these insects is the fly. Flies are not only a problem for farmers, they are also very annoying to ordinary people.Flies can transmit 50 kinds of diseases and important diseases affecting livestock and poultry farming, such as avian influenza, Newcastle disease, foot-and-mouth disease, swine fever, avian polychlorobacellosis, avian colibacillosis, coccidiosis, etc. When an outbreak occurs, it can accelerate the spread of epidemics, and large numbers of flies in livestock sheds can lead to irritability and contamination of eggshells. Fiies can also spread a variety of human infectious diseases, threatening the health of workers.
Post time: May-19-2021