Evaluation of a New Formulation of Permethrin Applied by Water-Based Thermal Fogger AgainstAedes albopictusin Residential Communities in St. Augustine, Florida
Abstract:The efficacy of a new water-based formulation containing 30% permethrin and 30% piperonyl butoxide against laboratory and field populations of Aedes albopictus was evaluated in the laboratory, in semifield experiments, and in residential communities in St. Augustine, FL. In laboratory bottle bioassay, 3 doses (3.18 g/ml, 2.26 g/ml, and 1.59 g/ml) of the permethrin product resulted in 100% mortality of adult mosquitoes in 1 h. In semifield experiments, the insecticide sprayed by the water-based thermal fogger a… Show more
“…The adulticide tested provided an immediate relief from high mosquito abundance. As observed in previous studies focusing on the evaluation of adulticide performance, the reduction was not permanent, resulting in mosquito population recovery to pretreatment abundance after 10 days. This could lead private citizens to make frequent applications of freely purchasable adulticides, thus increasing the development of mosquito resistance .…”
“…The adulticide tested provided an immediate relief from high mosquito abundance. As observed in previous studies focusing on the evaluation of adulticide performance, the reduction was not permanent, resulting in mosquito population recovery to pretreatment abundance after 10 days. This could lead private citizens to make frequent applications of freely purchasable adulticides, thus increasing the development of mosquito resistance .…”
“…Adulticides are very effective in suppressing adult populations but populations tend to quickly rebound [6,7]. Source reduction by eliminating potential larval habitats is also a key element of mosquito control.…”
BackgroundThe Asian tiger mosquito, Aedes albopictus, is a vector of dengue, Chikungunya, and Zika viruses. This mosquito inhabits a wide range of artificial water-holding containers in urban and suburban areas making it difficult to control. We tested the hypothesis that female-driven autodissemination of an insect growth regulator could penetrate cryptic oviposition habitats difficult to treat with conventional insecticidal sprays.MethodologyOviposition preferences of Ae. albopictus females for open and cryptic cups were tested in semi-field experiments. Two conventional larvicidal sprayers were tested to determine droplet penetration and larvicidal efficacy in open and cryptic habitats using Bacillus thuringiensis var. israelensis (Bti) in the field. Finally, the efficacy of pyriproxyfen autodissemination stations was assessed in cryptic and open cups in residential areas during 2013 and 2014.Principal FindingsGravid females strongly preferred cryptic (53.1±12.9 eggs/cup) over open (10.3±4.3 eggs/cup) cups for oviposition. Cryptic cups showed limited droplet penetration and produced 0.1–0.3% larval mortality with a conventional backpack and low-volume sprays of Bti. The autodissemination stations effectively contaminated these cryptic cups (59.3–84.6%) and produced 29.7–40.8% pupal mortality during 2013–2014. Significant pupal mortality was also observed in open cups.ConclusionsThe autodissemination station effectively exploits the oviposition behavior of wild gravid females to deliver pyriproxyfen to targeted oviposition habitats. Although the pupal mortality in cryptic cups was relatively lower than expected for the effective vector control. Autodissemination approach may be a suitable supporting tool to manage Ae. albopictus immatures in the cryptic habitats those are less accessible to conventional larvicidal sprays.
“…aegypti, reducing environmental impacts and costs. Alimi et al (2013) used water as a permethrin solvent with success from a thermal fogger on the container breeder Ae. albopictus.…”
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