Susceptibility of some species of mosquitoes to permethrin pyrethroid in Zaria, Nigeria.

Abstract

The susceptibility of

Aedes aegypti Linnaeus 1762,

Culex quinquefasciatus Say 1823 and

Anopheles gambiae Giles 1902 was tested on 0.75 % permethrin pyrethroid in the laboratory. All Larval and pupal stages of the mosquitoes were collected from different localities within Zaria, Nigeria and reared to adulthood in the laboratory. The adults that emerged were tested on 0.75 % permethrin strips using WHO Standard Test Kit. Mortalities were recorded at five minutes interval for 1 hr and maintained for 24hrs post-exposure on 7 % sucrose solution after which a final mortality was recorded. The Knockdown times (

KDT₅₀ and

KDT₉₅) were determined by Probit Analysis. 100 % mortality was obtained for

Ae. aegypti and

Cx. quinquefasciatus after 1 hr and 24 hr exposures, respectively, whereas

An. gambiae recorded 92.11 % and 90.91 % mortalities after 1hr and 24hr exposure, respectively. The

KDT₅₀ and

KDT₉₅ did not differ significantly (P>0.05) between

Ae. aegypti and

Cx. quinquefasciatus but differed significantly (P<0.05) with

An. gambiae. The study shows that

Ae. aegypti and

Cx. quinquefasciatus are susceptible to permethrin whereas

An. gambiae is resistant to the insecticide in the area.