We examined the insecticidal effect of three different dust formulations, which were attapulgite (W), mix with oregano essential oil 52% carvacrol (D1), and 75% (D2), in four major stored-product beetle species, Sitophilus oryzae (L.), Tribolium confusum Jacquelin du Val, Rhyzopertha dominica (F.), Trogoderma granarium Everts. was most susceptible at all followed by T. R. dominica. In contrast,...