| Popis: |
Aims: In the present study, the objective was to estimate the toxicity of an insect growthregulator with juvenile hormone-like activity, kinoprene, on Culex pipiens, the mostabundant and investigated mosquito species. Effects of this compound on growth anddevelopment were also evaluated.Methodology: A commercial formulation (Enstar 65% EC) was tested at differentconcentrations ranging between 162.5 and 650µg/L on newly molted fourth-instar larvaethat were exposed for 24 h under standard laboratory conditions according to WorldHealth Organization recommendations.Results: Kinoprene exhibited insecticidal activity by direct action on the treated fourth-instar larvae but also by differed action on the other following stages of development.Mortality occurred after earlier inhibition of their development or by their inability tocomplete their ecdysis. The LC 50 values were 1287.4µg/L for the direct action on fourthinstar larvae, and 246.8µg/L for the differed action until adult emergence. Moreover, thecompound disturbed growth and development since several morphological types and anincrease in the duration of larval and pupal stages were recorded. In a second series ofexperiments, the effects of kinoprene were examined on morphometric measurements ofOriginal Research Article |
