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A major pest of citrus orchards in northern regions of Iran is  Panonychus citri  which is mainly controlled by using chemical acaricides. Knowledge of the lethal and sublethal effects of pesticides on pests is necessary for successful performance of each control programme. In this study, the toxicities of fenazaquin and acequinocyl as well as the effects of the sublethal concentration LC 20  and LC 30  on demographic and some biochemical traits of  P. citri  offspring were studied. The results showed that the toxicity of acequinocyl was 2.18 times higher than that of fenazaquin. The developmental time of females was influenced and prolonged by sublethal concentrations of both acaricides. Sublethal concentration effects of both acaricides considerably decreased the total fecundity. A significant reduction was observed in the net reproduction rate ( R 0), and intrinsic rate of natural increase ( r ) of the mites exposed to LC 20  and LC 30  concentrations of both acaricides compared to control. Both acaricides showed a negative impact on the content of lipid, carbohydrate, and glycogen. The LC 20  concentration of fenazaquin resulted in an increase in general esterase activity, and both acaricides inhibited glutathione S-transferase (GST) activities. Our findings show that the sublethal doses of both acaricides had adverse effects on the biological and physiological characters of  P. citri .

international journal of acarology

Lethal and sublethal effects of fenazaquin and acequinocyl on demographic and some biochemical parameters of  Panonychus citri  (McGregor) (Acari: Tetranychidae)