White powdery substance on River Birch

Horticulture
1

I have the white substance on my river birch. I’m not sure if its mildew mites or fungus.

Any help with identification and treatment recomendations would be appreciated greatly.

TIA,

John3

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2

Hey John,

It kinda looks like this

3

Thanks I agree. I found these in my research:

https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5310329.pdf

Additionally I found this little bugger which may be related,

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