Rhyzopertha dominica(F.),Oryzaephilus surinamensis(L.),Tribolium castaneum(Herbst),T. confusumJacquelin duVal,Cryptolestes pusillus(Schönherr),Sitophilus granarius(L.), andS. oryzae(L.) were not appreciably affected by a commercial formulation of Bacillus thuringiensis var.kurstakion wheat or a flour-cornmeal mixture at 100 or 500 mg/kg. However,R. dominica,S. oryzae,T. castaneum, andT. confusumtransferred viable spores from treated to untreated wheat by carrying them externally or passing them with their feces.