midwestbonsai

Anybody ever get a whitist/grey mold on the soil surface of your trees?
It just apeared one day.
I was told by a horticulturalist to spry the surface with a vinagar water mix, and if that doesn't work a tea tree oil and water mix.
Well niether one seems to be doing the trick.
The amount of the mold has gone down, but not gone.
Any ideas?

Thanks

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