Catron IV is a screwworm and ear tick aerosol spray that controls insect pests on beef cattle, dairy cattle (including lactating), sheep, goats, swine* and horses. For use on wounds to kill and repel flies and fly maggots. Kills and repels face flies on livestock. Controls ear ticks on livestock. Contains a blue dye for identification of treated areas. *Do not ship swine for slaughter within five days of last treatment.