|
-
Cross-resistance Spectrum and Effects of Synergists in the Fenvalerate-resistant Mosquito,Cutex pipiens pallens(coq.)
Zhang Chaoyuan; Tang Zhenhua
A high level of 6088-fold population (RPy strain) of fenvalerate resistant
Culex pipiens pallens(Coq.)collected from Nanshi district in Shanghai was successfully developed in laboratory by treating the 4th instar larvae with fenvalerate. The Rpy strain showed high cross-resistant level for P, P'-DDT(>388X), for other Pyrethroids [6(Tetramethrin) to>140X (tran-permethrin)]. For Dieldrin, Dimethoate, Trichlorfon and Propoxur (1-2X), and for Fenitrothion, Methylparathion, Malathion, Temephos and Carbaryl (more susceptible than S strain).The in vivo studies of synergism by different special inhibitors such as Pb, TPP and DMC indicated that mechanisms of resistance in the Rpy strain might be associated with DDTase and mixed-function oxidase (MFO) for DDT-resistance, and MFO and Esterase for fenvalerateresistance.
|