this post was submitted on 25 Jul 2025
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Houseplants
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Bacillus thuringiensis israelensis is a bacteria that's really good at killing mosquito, fungus gnat, and black fly larvae. It's harmless to everything else and it's the active ingredient in "Mosquito Dunks".
You can break up a mosquito dunk into crumbles and soak them in a pitcher of water overnight to inoculate it with BTI. Water your plants with it to inoculate the soil and it'll kill off the larvae -- I go a little further and sprinkle crumbles over the soil in my pots to keep them inoculated.
It's my go-to for dealing with fungus gnats in plants and I've never had it fail.
I eventually got tired of seeing the fucking gnats so I got some of the mosquito bits and made the tea, and they were gone the same day. Just have to remember to do subsequent treatments for 3 weeks so you get each stage in the life cycle.