Japanese Maple Issue

Question

Maple has come out with patchy leaf growth and leaves that have come out are in poor state. White patches on bark of tree.

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Answer 1

Those patches on the bark will be unrelated, and are what is known as a Lichen. They are harmless, and only taking advantage of a good spot. That good spot, happens to be diseased trees! This appears that it could be bacterial. General fungicides can, usually, help.

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-care-pruning.htm

https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-care.htm