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U radu su prikazani rezultati laboratorijskih pokusa na uskladištenoj mekanoj pšenici infestiranoj s dvije vrste skladišnih kukaca: rižin žižak - Sitophilus oryzae L. i kestenjasti brašnar - Tribolium castaneum Herbst., obrađenoj kombinacijama mješavina dijatomejske zemlje (DZ) i piretrina (Diatect V, Diatect II, Bug-B-Gon, Perma-Guard D-20) i DZ bez piretrina (Protect-It, Perma-Guard i DZ iz Hrvatske). Rezultati su pokazali opravdanost mješavina DZ i piretrina, jer su značajno djelotvornije na test kukce u odnosu na DZ bez piretrina. S obzirom na to da Hrvatska ima nalazišta DZ-a i autohtoni buhač, moguće je mješavinom DZ i piretrina razviti ekološko prihvatljiv hrvatski insekticid za domaće potrebe, a, isto tako, i za izvoz u druge zemlje., This study shows results of laboratory experiments on stored soft white wheat infested with two stored pest species: rice weevil - Sitophilus oryzae (L.), and red flour beetle - Tribolium castaneum (Herbst), treated with different mixtures of Diatomaceus earth (DE) and pyrethrins (Diatect V, Diatect II, Bug-B-Gon, Perma-Guard D-20 ), and DE without pyrethrins (Protect-It, Perma-Guard and DE from Croatia). The obtained results confirmed that the mixture of DE and pyrethrin and PBO is useful against test-insects and generated significantly higher effectiveness when compared with the results obtained with DE without pyrethrins. Due to the fact that Croatia has the sources of good DE and indigenous Dalmatian pyrethrum, it is possible to develop and produce safe, natural and ecologically acceptable Croatian insecticide by using mixture of DE and pyrethrins, for domestic market and export.