Understanding the abundance of beneficial arthropods is important to refine integrated management for pests, such as billbugs, Sphenophorus spp. (Coleoptera: Curculionidae) in turfgrass. Two studies were conducted to determine the effects of (1) turfgrass growth cover (0, 50, 100%) and (2) seven commonly used insecticides on the abundance of beneficial arthropods in turfgrass. In the first study, the numbers of carabids, staphylinids, parasitic hymenopterans and Araneae were significantly lower in the 0 or 50% turfgrass cover treatments than in the 100% turfgrass cover treatment. The densities of other hymenopterans and mirids were less abundant in the 100% turfgrass cover treatment than in the 50% cover treatment. In the second study, methoxyfenozide, novaluron, tetraniliprole and chlorantraniliprole were less disruptive to beneficial arthropods, such as carabids, staphylinids, mirids, geocorids, formicids, parasitic hymenopterans and spiders. However, bifenthrin, imidacloprid and acephate + imidacloprid were disruptive to beneficial arthropods in turfgrass.