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  • Title: Comparative Evaluation of Metofluthrin as an Outdoor Residual Treatment for Barriers and Harborage Against Aedes albopictus (Diptera: Culicidae).
    Author: Bibbs CS, Kaufman PE, Xue RD.
    Journal: Environ Entomol; 2020 Apr 14; 49(2):435-443. PubMed ID: 31958123.
    Abstract:
    Spatial repellent studies have demonstrated that volatile pyrethroids reduce human contact with mosquitoes, but field trials targeting the volatile qualities of spatial repellent pyrethroids for integrated pest management are lacking. To investigate the stability and utility of volatile pyrethroids in mosquito management, metofluthrin was formulated into a vegetation spray intended for use on foliage and mosquito harborage. A comparative field evaluation was conducted between Onslaught Fast Cap, the experimental metofluthrin formulation, and a blended treatment of Onslaught Fast Cap and metofluthrin. Environmental fate of the metofluthrin formulation was estimated using aging bioassays to stress the formulated product, while leaf samples were taken from the treated field sites to bioassay against Aedes albopictus (Skuse) and determine a comparative rate of decay. The combined data from the aging bioassays and leaf samples allow inference that the experimental formulation lasts 2-3 wk in most lighting and humidity conditions at ~26.6 ± 1°C. However, regular rainfall jeopardizes continued efficacy. In comparative field efficacy, adult mosquito reductions were comparable between the two products. Onslaught Fast Cap reduced eggs collected in the immediate vicinity by 80-90% but had no effect in adjacent areas. Metofluthrin treatments resulted in a 50-90% reduction of eggs collected for 4 wk up to 60 m away from treated vegetation. However, the blended treatment using metofluthrin as an additive to Onslaught Fast Cap provided ≥80% control of Ae. albopictus adults and eggs, proximal and adjacent to treated areas, for the study duration. Metofluthrin has a great potential as a supporting ingredient to other insecticides.
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