The beneficial nematodes Stenernema feltiae are used for the biological control of the larvae of fungus gnats, black vine weevil, and the pupae of thrips in soil applications. In leaf applications these nematodes work to control the larvae of thrips. In recent years the the gel formula that the nematodes are packaged in was reformulated to expand the life span of the product while still maintaining the highest quality. After application, the nematodes actively seek out their prey and penetrate them. The nematodes feed on the contents of their host, excreting specific bacteria from their digestive tracts as they do so. The larvae die within a few days.