By : Abada A. Assar1, Magda M. Abo El-Mahasen1, Amira F.Afifi2 and Amany A. Rady2

Abstract

Laboratory studies were carried out to investigate the efficacy of the chitin synthesis inhibitor (cyromazine) against all larval stages of Culex pipiens. The compound was tested its efficacy on larval mortality, larval duration, pupation, pupal duration and adult emergence. Also, the histological effects of cyromazine on the midgut, the integument, the fatbodies and the muscles of 4th larval instar treated as 1st larval instar were studied. The tested compound increased the larval mortality, decreased the percent pupation and adult emergence and prolonged the pupal duration. Also, this compound elicited histological effects on the midgut, the integument, the fat bodies and the muscles of 4th larval instar of C. pipiens treated as 1st larval instar with 0.01 and 0.1 ppm.

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5. Biological and histopathological effects of cyromazine on the laevae of Culex pipiens (Diptera Culicidae).
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