Vigilante Bolus

The "Vigilante" bolus is an insecticide used with both dairy and beef cattle to reduce the number of flies in an area. It works by releasing an IGR (Insect Growth Regulator) that stops the development of insects before they become flies. Essentially preventing them from reproducing. The bolus, when used with an insecticidal ear tag, devastates the populations of Horn, Barn and Face flies.