Abstract: The effects of selective and wide-spectrum pesticides on the population dynamics ofcitrus red nite,Panonychus citri McGregor were studied by means of the methods oflife table in this paper.Treatment with the wide-spectrum pesticide(fenvalerate)incitrus orchards brought about the reemergence of citrus red mite in a short time be-cause of killing a lot of natural enenues.Meanwhile,the density of the pestdecreased in the orchards treated by the selective pesticide(hexythiazox).The intrin-sic capacity of increase rates(rm)of the mite population were 0.0625 and-0.0118after treatments of fenvalerate and hexythiazox,respectively.The densities of naturalenemies were very low in the orchards treated by fenvalerate while the reverse resultswere observed in the orchards where hexythiazox was applied.