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Good day. I have been battling fungus gnats in my house plants that have now spread to my tropical bonsai. I have done 2 hydrogen peroxide washes, 2 neem oil washes, applied 2 layers of diatomaceous earth and covered the soil with crushed rocks and applied nematodes. I still have the buggers. Should I do an emergency repot on my bonsai to get rid of them? It is late fall and I am in zone 6a/b. I have yellow sticky paper arriving today, Sevin powder and ceylon cinnamon to put on the soil as a last resort.

I have got rid of them with:
Less watering.
Sand as top layer.
Yellow traps (sticky).

Just keep them drier and you will get rid of them wait one or two days longer than normal before watering. And never water by dunkin the pot in a tub of water

Home Defense light spray in soil do not spray tree. Dilute 50/50 w purified pH balanced h20. I treat pines 3 times a season- spring wet season fall before dormancy.