Flies are second in importance after epidemiological mosquitoes. Seen all around the world, they are quickly adaptable. Often their food and breeding space are decaying organic matter from plant and animal origin. In Bulgaria there are around 100 species - some of whom live in close proximity to people and others - with domestic animals or nature, have no direct connection with people. The development of flies’ starts early in the spring to late autumn, with peak numbers in summer.

Flies usually have short lifecycle - shortly after reaching sexual maturity females lay eggs, larvae develop in garbage, manure or other decaying organics. The optimum temperature for development is 18 ˚ C, very low and very high temperatures are detrimental to the flies in the early stages of their development, as well as over 80% humidity. Flies reproduce rapidly in creating favorable conditions - poor sanitary conditions and high temperatures.

Flies are carriers of many diseases / bacterial dysentery, salmonellosis, cholera, typhoid, intestinal worms and others.