The most common synthetic varroacides in the United States are the formamidine amitraz, the organophosphate coumaphos, and the pyrethroid fluvalinate. ... the efficacy of many of these products in the United States has become limited, as Varroa populations have developed resistance to all of them
Haber, Ariela I., Nathalie A. Steinhauer, and Dennis vanEngelsdorp. "Use of Chemical and Nonchemical Methods for the Control of Varroa destructor (Acari: Varroidae) and Associated Winter Colony Losses in US Beekeeping Operations." Journal of economic entomology (2019).
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