USDA Scientists have found a way to control stable flies that cost the U.S. cattle industry billions of dollars each year. By using a single application of cyromazine — which interferes with molting and proper development of an insect’s external skeleton — on hay-feeding sites, scientist reduced the number of emerging stable flies by 97 percent. Reduced milk production in dairy cows, decreased weight gain in beef cattle and lowered feed efficiencies are caused by stable flies in barnyards and pastures. This costs the U.S. 2.4 billion dollars annually. Researchers also discovered the use of several catnip oils also help control stable fly populations. Read more.