Effects of sublethal exposure to metofluthrin on the fitness of Aedes aegypti in a domestic setting in Cairns, Queensland
| Autor: | Gregor J. Devine, Tamara S. Buhagiar, Scott A. Ritchie |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Cyclopropanes Male Veterinary medicine Insecticides Mosquito Control Time Factors 030231 tropical medicine Aedes aegypti 01 natural sciences lcsh:Infectious and parasitic diseases Toxicology Dengue 03 medical and health sciences Recovery period chemistry.chemical_compound 0302 clinical medicine Sex Factors Metofluthrin Aedes Pyrethroid resistance Bioassay Animals lcsh:RC109-216 Mortality biology Mortality rate Research Insect Bites and Stings biology.organism_classification Fecundity 3. Good health Insect Vectors Fluorobenzenes 010602 entomology Infectious Diseases Biting chemistry Pyrethroid-resistance Parasitology Biological Assay Female Queensland Spatial repellents |
| Zdroj: | Parasites & Vectors Parasites & Vectors, Vol 10, Iss 1, Pp 1-7 (2017) |
| ISSN: | 1756-3305 |
| Popis: | Background Metofluthrin is highly effective at reducing biting activity in Aedes aegypti. Its efficacy lies in the rapid onset of confusion, knockdown, and subsequent kill of a mosquito. In the field, there are a variety of scenarios that might result in sublethal exposure to metofluthrin, including mosquitoes that are active at the margins of the chemical’s lethal range, brief exposure as mosquitoes fly in and out of treated spaces or decreasing efficacy of the emanators with time. Sublethal effects are key elements of insecticide exposure and selection. Methods The metofluthrin dose for each treatment group of male and female Ae. aegypti was controlled using exposure time intervals to a 10% active ingredient (AI) metofluthrin emanator. Room size and distance from the emanator for all groups was maintained at 3 m. In bioassay cages, male Ae. aegypti were exposed at 0, 5, 10, 20, 30 and 40-min intervals. Females were exposed in bioassay cages at 0, 10, 20, 30, 40 and 60-min intervals. Mortality rates and fecundity were observed between the exposure time groups for both sexes. Results Female Ae. aegypti exposed for 60 min had a significantly higher mortality rate (50%), after a 24-h recovery period, than other exposure times, 10, 20, 30 and 40 min (P 0.05). Conclusion Regardless of sex, if a mosquito survived exposure, it would be as biologically successful as its unexposed counterpart. Portability of the metofluthrin emanator and delayed knockdown effects create opportunities for sublethal exposure and potential pyrethroid resistance development in Ae. aegypti, and should be taken into consideration in recommendations for field application of this product, including minimum exposure periods and a prescribed number of emanators per room based on volume. |
| Databáze: | OpenAIRE |
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