Baits consist of an insecticide mixed with a substance that is attractive to flies, such as sugar.
Fly sex pheromone is added to the formulation to increase the effectiveness of the bait.
Baits may be prepared by the user by mixing an insecticide with molasses, sugar, beer or other attractive substances. However, such mixtures may be hazardous for the user to prepare and their effectiveness may be erratic.
Commercial baits are usually formulated as granules which can be handled easily.
Placement of baits in pans or protected locations where flies are frequent will attract and kill many flies.