Japanese Willow - diseased bark

Beaconsfield, Canada

Hello folks, not sure if it's too late to save this Japanese Willow shrub but i need help identifying what's causing it to die. 2nd photo is a healthy branch; 3rd photo a diseased branch. I thought it might be white powder but i don't think so. The bark looks like it has scale building up. What is it and how to treat? Thanks for any help

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