Fly resistance to certain chemical sprays means more reliance on baits or space sprays of other chemical classes. Although fresh bait will help control flies, results may be poor if fly breeding is excessive. Apply baits (moist) after floor litter and manure have been removed. Use baits liberally for best control. Apply a minimum of 4 ounces of bait per 1,000 square feet of floor area. Increase amounts when flies are breeding prolifically. Some insecticide formulations used in residual surface sprays have label directions for mixing a sweetener (sugar, molasses or corn syrup) to make your own fly baits or bait sprays. (Follow label directions and safety precautions.) Most commercially packaged baits include sugar and a nonfood fly aggregate attractant called Muscalure (Fly Stik,Muscamone). Baits are most effective when used in conjunction with other control measures. However, do not apply baits where livestock, poultry , dogs, cats, wildlife, birds or children may eat them. Do not contaminate feed or water.
(a) diazinon (Dryzon) . Mix one half pound 50 percent WP with one pound sugar (two cups of syrup or molasses) in 2.5 gallons of water and spot treat areas frequented by flies including cracks, crevices, doorways around windows or other areas where flies congregate.
(b) methomyl (Stimukil, Apache, Improved Golden Malrin, Fatal Attraction, Fly Bait Plus, Tail Spin, Fly Patrol) 1 percent Dry Bait kills by contact and/or ingestion.
(c) trichlorfon (Dipterex) one percent Dry Bait kills by contact and/or ingestion.
These commercial "ready-to-use" dry sugar baits can be scattered in areas where flies congregate or applied in empty gallon plastic jugs with four two one-inch-diameter holes cut around the top to hold the bait (one to two ounces per jug). Hang jugs from ceiling by wire. Pour out dead flies and replace bait weekly.