Integrated Vector Management for Constructed Treatment Wetlands

Principal Investigator: William Walton

The objectives of this project are to develop an integrated vector management (IVM) strategy (1) to reduce the use of adulticides against mosquitoes of public health importance, (2) to reduce mosquito harborage, and (3) to reduce the need for costly vegetation management in man-made wetlands used to improve water quality . We propose to study mosquito production, the co-occurring aquatic invertebrate community including mosquito predators, the temporal changes in the emergent vegetation and nutrient removal capabilities in six replicate 0.1-ha wetlands planted with the alkali bulrush, Schoenoplectus maritimus . The alkali bulrush is smaller than the macrophytes found typically in constructed wetlands and has characteristics that may reduce mosquito production and the need for costly vegetation management.  During the winter between years 1 and 2, the wetlands will be divided into two hydrological regimes that are predicted to differ in the potential to reduce the biomass of the natural winter dieback of S. maritimus and result in significantly smaller mosquito populations during the period when arboviruses increase naturally in the reservoir and vector populations . The effects of the two hydrological regimes on the sustainability of the emergent plants, water quality performance, and reduction of mosquito populations will be assessed in year 2.

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