Simple SummaryNitrogen treatment is a promising method for controlling stored product insects. It is based on the alternation of the oxygen level in the atmosphere (lower than 3%), which can be lethal to insects. In the present study, we tested nitrogen treatment (>99%) on a commercial scale to control major stored product insects such asSitophilus granarius(L.),Sitophilus oryzae(L.),Rhyzopertha dominica(F.),Prostephanus truncatus(Horn),Tribolium confusumJacquelin du Val, andOryzaephilus surinamensis(L.). The current work indicates that nitrogen treatment is effective for all life stages and populations tested.AbstractIn this study, we evaluated the insecticidal effect of nitrogen againstSitophilus granarius(L.),Sitophilus oryzae(L.),Rhyzopertha dominica(F.),Prostephanus truncatus(Horn),Tribolium confusumJacquelin du Val, andOryzaephilus surinamensis(L.). Four trials were conducted in chambers containing flour in bags or sacks with >99% nitrogen level. Adults of all the above species, as well as immature life stages (eggs, larvae, and pupae) ofT. confusumwere used in the trials. Our results showed that nitrogen caused high mortality for all species and life stages tested. Some survival was recorded forR. dominicaandT. confusumpupae. Low progeny production was recorded forS. granarius,S. oryzae,andR. dominica. In conclusion, our trials indicated that a high nitrogen environment can provide satisfactory control of various primary and secondary stored-product insect species.