Plots of transplanted cauliflower were assessed over a 3-year period to determine the effects of insecticide on the cabbage maggot,Hylemya brassicae(Weidemann); the small carabid beetle,Bembidion lamprosHerbst and the staphylinid parasite,Aleochara bilineataGyllenhal.B. lamproswas the main species taken in pit-traps, and its numbers were unaffected by applications of granular chlorfenvinphos. Untreated plants averaged 7.7, 12.2 and 12.6 puparia in 1976, 1977 and 1978 respectively, of which 30.8, 42.6 and 62.2 percent were parasitized byA. billineata. Treated plants had fewer puparia with lesser percentage parasitism. Bioassays with granular insecticides in soil showed thatB. lamproswas quite tolerant to chlorfenvinphos, somewhat susceptible to carbofuran and isofenphos and very susceptible to terbufos.