Steinernema feltiae can be used as biopesticide against weevils, cutworms, mole crickets and - importantly for house plants - gnats.
this post was submitted on 09 May 2026
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Sf has a low level of efficacy. These nematodes are very good at preventing infestation and should be used sparingly. However they are pretty shit at controlling an infestation once it becomes established. It's a numbers game. S. feltiae and other endoparasitic nematodes don't reproduce fast enough to keep up.
Bti is a much better control mechanism for fungus gnats once they are established.