Because of consumer product emphasis, spatial repellents lack a vehicle to be delivered to mosquitoes in area-wide management of mosquitoes. In this study, metofluthrin was evaluated in laboratory and as an outdoor residual treatment in the field against peridomestic Aedes species with the intent of reducing fitness of target populations. Laboratory reared pyrethroid susceptible and pyrethroid resistant Ae. aegypti were evaluated alongside a field strain from St. Augustine, FL. With as little as 60s of exposure at a sub-lethal concentration, changes were observed in oviposition behavior, egg yield, egg viability, and survival of the F1 generation. As a follow-up, field sites harboring Ae. albopictus were treated with a metofluthrin formulation provided by MGK/Sumitomo Chemical Company in comparison to and in combination with a variety of conventional pyrethroid residual sprays. Through pre- and post-treatment surveillance of control and treatments sites, it was found that metofluthrin reduced eggs collected up to 60m away from treated vegetation. Furthermore, the duplex treatments maintained longer residual and greater reduction of egg collections as compared to the solitary treatments. Additionally, the metofluthrin and duplex treatments appeared to compromise the viability of eggs collected from treated sites when attempting to rear them out in laboratory. Based on this initial work, it appears metofluthrin may best serve as a supporting ingredient if used in area-wide mosquito abatement products.

Investigations for reducing fitness in peridomestic mosquitoes using spatial repellents

2019 Fall National Meeting

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