Flies have been a nuisance insect for thousands of years. They affect human welfare because they can transmit diseases. Flies such as the common house fly are classified as filth flies because they breed in rotten food, manure, and garbage. A fly can mature from egg to adult in as few as ten days. This quick maturity can cause a severe fly problem in a short period of time. Getting rid of flies long term begins with proper sanitation and exclusion. To kill the existing fly population insecticides are used. The insecticides come in residual forms, aerosols, fogging materials, and baits.