Kitsune

Do you have moss on your soil? If so, is it dying? Or do you use an organic fertilizer that sits on the surface of the soil? Sounds like you have gnats or something similar. They'll congregate where there is rotting matter. No harm to the tree really, but not bugs you really want to have around. Get rid of anything that could be rotting on the soil surface, bury the fert under a layer of soil and they shouldn't be a problem.

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