What’s Wrong With My Pieris Flaming Silver?

Question

It came up beautiful pink leaves in spring but now the leaves are dying and falling off and it looks infected.

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Answer 1

This looks to be sooty mold. Usually, this is caused by insect damage, but can be brought about by soils that do not have a chance to dry out between watering, also.

https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm