Sciarid flies
Lycoriella species are mainly found in commercial mushroom cultivation where they can cause enormous damage. Sciarid flies are usually found in damp, humid environments [...] on organic remains and the fungi that grow on them, although some species can also eat living plant material. The adults prefer humid habitats and are attracted [...] plant material and on algae and fungi present in the soil. They, however, can also feed on root hairs, rootlets, and tender root, stem and leaf tissue.