Q.Why do I keep finding decayed or sick leaf debris in my established shrubs
For the past two years I have been finding rotted tree bark and branches, chewed or broken leaves from my somehow sick maple trees, as well as other garden debris wrapped around my healthy shrub or in between my ornamental pines but mainly a problem for a hedge of Six ‘spitfire’ hydrangeas! Wherever the debris is left, the pine tree/ bush or shrub and other perennials become brown, foliage falls off! What is causing thiis?Why??

I'm a bit unclear on the question.
This link has information on Maple Tree diseases.
https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tree-bark-disease.htm
We do recommend raking and removing any leaves that fall that may be infected with pests or diseases to keep from spreading to other plants.
You should dispose of and not compost this litter.
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