mosquito control, pesticides, persistence, aquatic environments, sediments, estuarine
Aerial applications of liquid methoprene are used in salt marshes to control mosquitoes by preventing adult emergence. Despite concern about toxicity to non-target organisms, little is known about environmental concentrations after applications, nor methoprene's persistence in salt marsh environments. Aqueous and sediment samples were collected from two marshes receiving weekly applications. Aqueous samples were collected as early as 30 minutes after applications and as long as nine days afterwards; sediment samples were taken within hours of application and as long as 19 days post-application. Use of time-of-flight liquid chromatography – mass spectral analysis allowed for ultra low detection limits (0.5 ng/L) in water samples. The data show loss of nearly all methoprene from 1 m deep marsh ditches within 1 day and presence but not accumulation of methoprene in marsh sediments despite repeated applications. Methoprene concentrations observed in salt-marsh mosquito ditches were below those found to be of toxicological significance in other studies.
Tonjes, David J.; McElroy, Anne E.; Barnes, Robin K.; Ninivaggi, Dominick V.; Dawydiak, Walter; Greene, Gregory T.; and Brownawell, Bruce J., "Fate of methoprene in temperate salt marsh ditches following aerial applications" (2018). Technology & Society Faculty Publications. 23.
Entomology Commons, Environmental Health Commons, Environmental Indicators and Impact Assessment Commons, Environmental Monitoring Commons, Marine Biology Commons, Oceanography Commons, Sustainability Commons, Toxicology Commons
Tonjes, DJ, AE McElroy, RK Barnes-Pohjonen, DV Ninivaggi, W. Dawydiak, GT Greene, and BJ Brownawell. 2018. Fate of methoprene in temperate salt marsh ditches following aerial applications. Science of the Total Environment 642:394-407. DOI 10.1016/j.scitotenv.2018.06.070