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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As long as they manage to find food and don't dry out, basically forever. My Nepenthes likes constantly slightly moist soil, so the gnats took a liking to it. At some point it got rather annoying, so I applied SF nematodes. Since then I see maybe one gnat per week.
The gnats are not gone, but they now regulate themselves, so they stopped being a problem.