STRATEGIES AND TACTICS FOR PREVENTION AND MANAGEMENT OF HORN FLY RESISTANCE

The development and use of ear tags containing pesticides in the mid-1 970s led to the control of horn flies throughout most of the United St ates. In the last decade, however, evidence has shown that horn flies have developed a high resistance to pyrethroids. This situation repres ents the first potential loss of a major pesticide group to resistance in the large animal health area in the United States. Specific treatm ent options are presented, and ways of increasing producer education a nd awareness of horn fly resistance and control are discussed.