P 10 - Impact of native and invasive grasses on the behavior of Aedes aegypti, vector of dengue and yellow fever virus

Abstract: Invasive plants alter the structure and function of ecosystems and can influence native species populations. Invasive plants are known to alter the distribution and abundance of arthropods of disease vectors of humans and livestock by modifying habitats and resource availability. In Texas rangelands, several invasive grasses are known to displace native grasses and shrubs that can potentially influence the prevalence of vector borne diseases. We analyzed the impact of native and invasive grasses on the oviposition behavior of mosquito species Aedes aegypti, the vector of dengue and yellow fever virus. We used oviposition and gravid traps to assess behavioral response. Preliminary results show no statistical difference in oviposition and flight behavior of Ae. aegypti in response to native grass infusions, invasive grass infusions, or tap water. This study was limited by an extremely hot and dry summer which reduced the overall mosquito collections. We aim to repeat sampling at different times of the year when there is increased mosquito activity. A four-port bioassay experiment is planned to examine the attraction and repellency of the grasses on adult mosquitoes. The results will help in understanding the synergy between invasive plants and mosquitoes and assist in planning comprehensive management for invasive plants.