Abstract: The induction of plant allelochemicals on the cotton bollworm tolerance to in secticides was investigated using the method of mixture of plant allelochemicals and artificial diets. The insecticide tolerance of F_l, F₂ or F₃ generation population of cotton bollworms fed on the artificial diet containing rutin was stronger than that of the population fed on onlyartificial diet, while the susceptibility of Fa generation population to insecticides was almost the same with that of the artificial diet-fed population. The susceptibilities of the quercetin fed F_l and F₂ and the 2-tridecanone-fed F_l generation populations to methyl parathion reduced significantly compared with the artificial diet-fed population. However, there was no difference of susceptibility to methomyl and deltamethrin between the quercetin- or 2-tridecanone-fed population and the artificial diet-fed population.

Key words: plant allelochemicals, induction, cotton bollworm, insecticide