tIn order to evaluate the insecticidal activity of a formulation of the mixture made of ammoides verticillata essential oil with diatomaceous earth on Tribolium confusum, the Tribolium were exposed to diatomaceous earth at different concentrations: 0.0mg, 0.2mg, 0.8mg, 1.4mg, 2mg, and 3mg/cm² in Petri dishes, and their mortality rate was monitored every 24 hours for up to 120 hours, and to different concentrations of the essential oil (00µl, 02µl, 04µl and 8µl). We checked their mortality rate after 24h, 48h, 72h, 96h, and 120h.After having positive results, we tested the concentrations of the combination of diatomaceous earth and essential oil of Ammoides verticillata as follows; lethal dose (LD) 10 of diatomaceous earth + LD10 of essential oil, LD30+LD30, LD50+LD50, LD70+LD70 and LD90+LD90 in petri dishes. The mortality of Tribolium confusum population treated with diatomaceous earth and essential oil was highly significant (P<0.000), the statistical results gave us a LC50 at 0.60mg/cm² for diatomite and LC50 of 3.04µl for essential oil.The combination of essential oil and diatomite gave us very significant results. We noticed the maximum mortality (100%) with LD90+LD90 after 48 hours of exposure