One horn fly can leave 20 to 30 bites on an animal. Multiply that by 200 flies per animal and you not only have a nuisance, but also a loss in performance. The first round of horn flies emerges in late spring, so start getting ready to protect cattle. Advice on dealing with horn flies can be found in a short audio message from University of Kentucky extension entomologist Lee Townsend.

See “Dealing with horn flies.”