Technical Abstract: The objective of this paper is to provide an overview on using entomopathogenic nematodes for insect pest control. Entomopathogenic nematodes (genera Steinernema and Heterorhabditis), are be used as natural biopesticides. Unlike plant parasitic nematodes, which can be serious crop pests, entomopathogenic nematodes only kill insects. Entomopathogenic nematodes used in biological pest control kill insects with the help of symbiotic bacteria (Photorhabdus and Xenorhabdus associated with Heterorhabditis and Steinernema, respectively). Once the nematodes enter the insect they release their bacteria and reproduce inside the host. There are more than 80 species of entomopathogenic nematodes but only about 12 species have been commercialized for use as biopesticides. Some important factors to consider when apply beneficial nematodes are 1) adequate moisture or high humidity is critical to success, 2) avoid direct sunlight and temperature extremes (optimum temperatures for nematode activity are generally between 20 and 30 C), 3) maintain adequate aeration, 4) store nematodes at 4 to 10 C prior to use, but try to use them as soon as possible. Entomopathogenic nematodes can be applied to control a wide of important insect pests such as various Lepidoptera larvae, Curculionidae and other Coleoptera, wood-boring sesiids, etc. However, it is important to match the target pest with a specific nematode species that is known to kill that host. The nematodes can be applied using most standard agricultural sprayers and irrigation systems, anything from a watering can or backpack sprayer to tractor pulled sprayer will do.