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	Horn Fly Management for Wyoming Beef Cattle
	Publication #: B-1386 Date Published: 11/17/2022 Publication Author(s): John Derek Scasta C. Calkins Shelby Rosasco John Connett, Scott Schell

Description:
Horn flies (Haemotobia irritans) are an external parasite of cattle causing more than $1.75 billion in annual losses to the U.S. beef cattle industry. These flies are not native to the United States and were first recognized in the country in 1887 and are now found nationwide. Due to their preference for laying eggs in the dung piles of cattle, they are considered a filth fly. In Wyoming, horn flies can reach infestations that cause reductions in animal production and justify efforts to reduce their negative impacts. This bulletin reviews the life cycle of horn flies, economic threshold for treatment, trends in Wyoming, estimating infestation levels, and treatment options.

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