Where to post disease ID request?

[Chefunk]

Hello - new to Bonsai Nit, and Bonsai in general. I need help identifying what’s going on with a Japanese Maple. It seems to be growing great, but has developed powdery white “dust” on some leaves. Wondering what action to take. Have pics to post if needed. Thanks for advice.

I guess I might as well add a picture!

 

[rockm]

That's powdery mildew. It comes from humidity and not enough air circulation and light.

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