Seven chitin synthesis-inhibiting compounds were evaluated for activity against stored product insects in wheat. None of the compounds was acutely toxic to any species. N-[4-(4-nitrophenoxy)-3, 5-dichlorophenyl amino carbonyl]-2-chlorobenzamide with ID95values of 0.1, 0.1, 0.3, 0.7, 0.8, 0.3, and 0.5 ppm, was most effective as a suppressor of development of the confused flour beetle,Tribolium confusumJacquelin duVal, granary weevil,Sitophilus granarius(L.), lesser grain borer,Rhyzopertha dominica(F.), rice weevil,S. oryzae(L.), sawtoothed grain beetle,Oryzaephilus surinamensis(L.), almond mothEphestia cautella(Walker), and Indianmeal moth,Plodia interpunctella(Hübner), respectively. Other compounds were at least 10 times less effective.