In a review of one of the newer insecticides, diflubenzuron (Dimilin, TH-6040, [ i( 4-chloropher@l )-3( 2,6-dlfluorobenzoyl ) urea]), MARX (1977) emphasized that its ability to i~pair chltin synthesis, leading to toxicity in insects, is useful for controlling several insect pests. Diflubenzuron, one of many chitin inhibitors, is registered for use against the gypsy moth, a pest destructive to forests. Applications are pendlng for registration by the U.S. EmviroGnental Protection Agency for additional uses, including protection of cotton and soybean crops and as a mosquito larvicide (possibly in coasta! waters). Addit 8 advantages of diflubenzuron cited by MARX (1977) were: (i) low application rates to achieve control of target species; (il) inability to move thro~~~h the food chain, thereby averting concentration in higher car~_ivores; and (iii) degradation in the enviroGnent unlike some organochiorine pesticides.