Steinernema spp.
From Bugwoodwiki
Insect-parasitic nematodes in the genus Steinernema are similarly applied to soil as a drench to control larvae of various insects. They are somewhat more specific in their host range and do poorly on beetle larvae, but do have a wide range that includes most other insects that have some life stages in soil. Most commonly available is Steinernema carpocapsae which is used for control insects such as cutworms, thrips pupae, and fungus gnat larvae. Steinernema feltiae (=bibionis) (e.g., ScanMask, Gnat Not) is thought more effective for control of fly larvae such as fungus gnats and is widely used in greenhouse settings as well as for outdoor use. Steinernema scapterisci is used for control of mole crickets.
