Impacts of ground-based ULV pyrethroid sprays on abundance and age structure of the Zika vector, Aedes aegypti (Diptera: Culicidae), in urban Arizona

• DOI: 10.1093/jme/tjaf024
• Publication Date: 2025-04-03T20:22:23Z
• Authors: Kathleen Walker; Dawn Gouge; Daniel Williamson; Joshua Arnbrister; Teresa Joy; James Will; John Townsend; Shujuan Li; Shakunthala Nair; Maureen Brophy; Valerie Madera Ga...; Kacey Ernst; Yves Carrière; Michael Riehle
• Keywords: Mosquito control

Abstract Aedes aegypti (L.), the primary mosquito vector of arboviruses such as dengue and Zika, has a global distribution that includes southern United States. Control this peridomestic is challenging. Ultra-low volume (ULV) pyrethroid sprays are commonly used against adult mosquitoes to break transmission during disease outbreak, although efficacy data limited. This study examined impacts ULV on Ae. vectorial capacity measured by abundance age structure in two cities Maricopa County, AZ with robust populations well-developed management program. We assessed routine applications conducted Vector Division summer rainy seasons 2017 2019 determine whether existing practices mainly targeting Culex spp. also suppressed aegypti. The insecticide formulations applied for control (Duet Permanone 30-30) did not affect abundance, but Duet slightly reduced female age. Deltagard, product specifically aegypti, was only three times 2018 over small areas, so assessment difficult. Deltagard associated decline abundance. CDC bottle bioassays collected area showed resistance permethrin deltamethrin. Overall, lack significant population suppression or changes after suggest current tools unlikely effectively event outbreak.