| Summary: | The Mediterranean flour moth, <i>Ephestia kuehniella</i> Zeller (Lepidoptera: Pyralidae) and the confused flour beetle, <i>Tribolium confusum</i> Jacquelin du Val (Coleoptera: Tenebrionidae) are worldwide spread and notorious organisms of numerous stored-products. Both species are dangerous for bagged commodities as penetrators and invaders. The aim of the current study was to examine the efficacy of thiamethoxam, pirimiphos-methyl, alpha-cypermethrin, and deltamethrin, against <i>E. kuehniella</i> and <i>T. confusum</i> larvae, on different types of storage bag materials, i.e., woven propylene, biaxially oriented polypropylene and kraft paper through a (quasi)-binomial modeling approach. The type of the tested storage bag material did not affect the mortality rates of both species when treated with the tested insecticides. Thiamethoxam and pirimiphos-methyl showed statistically significant higher mortality rates on <i>E. kuehniella</i> and <i>T. confusum</i> (beta coefficient = 0.141; <i>p</i>-value < 0.05) compared to alpha-cypermethrin and deltamethrin. In addition, <i>T. confusum</i> exhibited significantly higher mortality rate in comparison to <i>E. kuehniella</i>. Our results also showed that the tested doses and surface treatments had a significant effect on the mortality <i>E. kuehniella</i> and <i>T. confusum</i> larvae. Significantly higher mortality rates were recorded when larvae were exposed on bag materials having both surfaces treated or on the single treated surface than when they were exposed on the untreated surface. Our findings can be useful towards an effective management strategy against stored-product insect pests.
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