Elanco - Elector bait offers ongoing, effective control of house flies, with no known resistance. The new insecticide class, spinosyn, makes Elector bait the ideal foundation product for fly bait rotation. Delayed action means flies eat, then die away from bait, keeping the bait clean for optimal performance. Can be used outdoors around animal housing, including poultry houses, rabbits on wire, dairy barns and milking parlors, hog farms, livestock barns, feedlots, fur-bearing animal units, horse barns, stables, and any other animal handling or feeding facilities.