Horn Fly Resistance

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Merial has created a new testing kit for horn fly resistance. The Merial Reistance ID (RID) Testing Kit can help producers predict whether standard ear tags will lead to a blooming population of hard-to-kill flies. If so, it gives producers information on whether additional horn fly protection is warranted. The goal, the company says, is not eradication, but to keep adult fly populations below economic thresholds and to manage insecticide resistance. The Horn Fly Resistance ID Program involves a susceptibility test, which confirms the presence of resistant horn flies and helps producers with a proven control program, Merial says.The company is also recommending the combined use of ear tags and treatments with Eprinex (eprinomectin) Pour On, which can provide up to 12 more weeks of horn fly control. Using pour-on parasite control at turnout and in mid-summer, combined with ear tags, is proven by a decade of trials to dramatically increase horn fly kill and to reverse the trend of fly population resistance to common insecticides, which is another economic boost in controlling internal parasites in mid-summer, when pastures are at their highest level of infestation by worm eggs, the company says.

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