64 - Giving Remoa a Tri: A Virginia cage field trial

In 2018 insecticide monitoring in Suffolk, Virginia revealed Culex pipiens was resistant to all pyrethroids, malathion, and chlorpyrifos. Since that year other cities and counties in Virginia began to discover the same results. Since Cx pipiens is our primary vector for West Nile Virus it is important that we find a way to combat this resistance and control this mosquito population when it becomes a public health emergency. Pesticide rotation is an essential component when developing a strategy to control insecticide resistance. Unfortunately these Cx pipiens are not susceptible to any of the active ingredients in ground sprayed adulticides that are available on the market. So when we learned about ReMoa Tri, a new adulticide comprised of three active ingredients with three different modes of action we were interested in seeing how this new player would perform with our resistant Cx pipiens population.  A standard cage field trial was performed with mosquitoes from Suffolk and Chesapeake, VA against ReMoa Tri and Zenivex E20.  Overall ReMoa Tri was effective against local resistant populations of Culex pipiens in Suffolk and Chesapeake with mortality rates as high as 97.5% and the lowest rate being 32.5% over a 48 hour period.  In contrast local populations of both cities were resistant to Zenivex E20, producing high mortality rates at a mere 22.86% and low rates of 0% over a 48 hour period.