Steinernema feltiae
feed and reproduce within the cadaver of the dead host, resulting in the emergence of a new generation of nematodes that can continue to seek out and infect [...] for their effectiveness in controlling a variety of pests, including flies (i.e fungus gnats ), thrips , beetles , caterpillars , lace bugs and sawflies. [...] feltiae nematodes effectively control pests by parasitizing and killing them, providing a natural and environmentally friendly method of pest management