INSECTICIDE SUSCEPTIBILITY STATUS OF AEDES AEGYPTI IN UMUDIKE, IKWUANO LGA ABIA STATE, NIGERIA

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Keywords: Aedes aegypti, Insecticide, Knockdown times, Susceptibility, Umudike, Bendiocarb, Primiphos-methyl, Deltamethrin,, DDT

Abstract

This study was conducted in order to evaluate the insecticide susceptibility status of
Aedes aegypti in Umudike, Abia State, Nigeria. Larval and pupal stages of the mosquitoes
were collected from different points within Umudike, and reared to adulthood in the
laboratory. The adults that emerged were tested on 4 % DDT (organochlorines), 0.1 %
bendiocarb (carbamates), 0.25 % primiphos-methyl (organophosphates) and 0.05 %
deltamethrin (pyrethroids) procured from National Arbovirus and Vector Research
Institute, Enugu. Twenty sugar fed female Aedes aegypti mosquitoes aged 3 – 5 days
were used for the bioassay which was replicated four times with two control. Knockdown
was recorded at five minutes, and then 10 minutes interval for 1 hour and then
maintained for 24 hours post-exposure on 7 % sugar solution, after which a final
mortality was recorded. The Knockdown times (KDT 50 and KDT 90 ) were determined by
Probit analysis. Aedes aegypti was susceptible to all the insecticides but DDT, with 24-
hour post exposure percentage mortalities of 62.85, 100, 97.50 and 93.75 in DDT,
bendiocarb, primiphos-methyl and deltamethrin, respectively. It is necessary that the
mechanism behind this resistance displayed by Ae. aegypti mosquitoes in Umudike to
DDT be investigated. Routine surveillance of insecticide susceptibility/resistance in wild
mosquito population is also advocated in line with integrated vector control strategy in
Umudike.

Published
2019-01-07