The history of entomopathogenic nematology is briefly reviewed. Topic selections include early descriptions of members
of Steinernema and Heterorhabditis, how only morphology was originally used to distinguish between the species; descriptions of the
symbiotic bacteria and elucidating their role in the nematode- insect complex, including antibiotic properties, phase variants, and
impeding host defense responses. Other topics include early solutions regarding production, storage, field applications and the first
commercial sales of entomopathogenic nematodes in North America. Later studies centered on how the nematodes locate insect
hosts, their effects on non-target organisms and susceptibility of the infective juveniles to soil microbes. While the goals of early
workers was to increase the efficacy of entomopathogenic nematodes for pest control, the increasing use of Heterorhabditis and
Photorhabdus as genetic models in molecular biology is noted.Keywords: Heterorhabditis spp., Entomopathogenic nematodes, Steinernema spp., Histor