Chinese Elm Advice!

On base of the bark heres a better pic.

If it were mine I would use something like neem or all seasons oil and gently hit it with a toothbrush weekly for a few weeks. That is a LOT of build up! Consider never watering any of it except the substrate surface with a small watering can. Filtered water won't stop that it will just reduce it. We have a very good whole house filtration system and I frequently just use watering cans and never do a foliar spray. My Wife has a few decent pots inside and outside for the Summer - those get Distilled water as it is inexpensive and not much is needed for the small stuff.

Grimmy
 
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