 The bacteria enter the nematode progeny as they develop.3,5-Dihydroxy-4-isopropyl-trans-stilbene is produced by "P. luminescens" bacterial symbiont of the nematode "Heterorhabditis megidis".Experiments with "Galleria mellonella" infected larvae supports the hypothesis that the compound has antibiotic properties that help minimize competition from other microorganisms and prevents the putrefaction of the nematode-infected insect cadaver.