Prozap® Screw Worm and Ear Tick AerosolProzap Screw Worm and Ear Tick Aerosol is a multi purpose, permethrin spray used to control insects on beef and dairy cattle, sheep, goats, hogs and horses. Contains a violet marking dye for use on wounds to identify treated areas and uniform coverage. Designed to kill and repel flies and fly maggots, and ticks (including ear ticks) on livestock. Prozap Screw Worm Ear Tick Aerosol provides wound protection from flies and maggots Contains 0. 5%