Steinernema feltiae is a microscopic roundworm that parasitises insects living in moist soil. Its infective juveniles enter a host through natural openings and release symbiotic bacteria (Xenorhabdus species) that kill it within a couple of days. New nematodes breed inside the body and leave to hunt again. It is one of several entomopathogenic nematodes sold for crops; it works at cooler soil temperatures than many others.
In practice
Growers mix the product in cool water and drench the medium, mainly against fungus gnat larvae and soil-pupating thrips. Nematodes are alive and fragile: store them refrigerated, use them before the expiry date, apply in the evening or under low light, keep the medium moist for several days afterwards, and do not mix them with high-EC solutions or disinfectantsbeing reviewed. Repeat applications every one to two weeks during heavy pressure are common. They pose no known risk to plants, people or pets.
Don't confuse with
- Root-knot nematodes: plant-parasitic nematodes that damage roots; a different group.
- Bti: a bacterial toxin that must be eaten by larvae.
- Stratiolaelaps scimitus: a predatory mite for the same pests.
