ClariFly® Larvicide is a feed supplement that prevents adult house flies, stable flies, face flies, and horn flies from developing in and emerging from the manure of treated cattle. Unlike conventional insecticides that attack the nervous system of insects, ClariFly® works by interrupting the fly’s life cycle, rather than through direct toxicity. When mixed into cattle feed, ClariFly® passes through the digestive system and into the manure. With only very small concentrations, ClariFly® is able to disrupt the normal molting process of the fly larvae. The mode of action of ClariFly® is specific to insects. It disrupts the production of a substance called chitin, a key component of an insect’s exoskeleton that is NOT found in mammals. Without a properly formed exoskeleton, the immature fly cannot survive to adulthood.