Prozap DyFly Aerosol Insecticide Prozap DyFly Aerosol Insecticide spray contains 0.5% Pyrethrins and 5.0% Piperonyl Butoxide to offer a quick knockdown and killing power. This high performing synergized aerosol spray is ideal for use on horses beef and dairy cattle and hogs. DyFly can be used in stables barns food processing areas houses milk rooms and poultry houses. Prozap DyFly Aerosol Insecticide works on: flies hornets wasps moths gnats ants mosquitoes roaches spiders and many other insects ProZap DyFly is safe for use in: stables barns food processing areas houses milk rooms poultry houses