Abstract
Steinernema and Heterorhabditis are not closely related phylogenetically but they share many characteristics via convergent evolution. Over 100 species of Steinernema have been described. Here we focus on Steinernema carpocapsae. All entomopathogenic nematode (EPN) species are symbiotically associated with entomopathogenic bacteria: S. carpocapsae retains Xenorhabdus nematophila. The bacteria kill the insect host along with EPN-produced factors, provide nutrition for the EPNs, and produce metabolites that protect the infection by inhibiting opportunistic colonization by other soil organisms. S. carpocapsae is a common species isolated from soil from every continent except Antarctica and was the first EPN-produced in vitro and commercially developed for pest control. To date, 12 species of EPNs have been commercialized for biological control of soil insect pests for agriculture, municipalities, and homeowners.
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