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I used some nematode worms. Worked a treat and they haven't returned.
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Like Kat said, hydroleca or something similar to cover the soil surface. Can use horticultural grit too, but it is more annoying to remove if you want to top-dress/repot etc.
You can also hang a yellow sticky trap or two which will help drop the numbers quite quickly.
Brommers
rhowe
@Rich_G
Fungus nats....I keep getting them on my house plants. I've changed the soil tried and to keep the top dry but still they come back. Does a small covering of gravel on the top help ? They are so annoying. Are there any bug sprays to get rid of them ?