how do you treat sky pencil holly disease?

Question

The shrub has patches of dry leaves that looks like disease or insect.

Answer 1

Here is a link that lists common problems with Holly.
Trim away the dead and diseased material and dispose of. Clean any plant material from the ground also.

https://www.gardeningknowhow.com/ornamental/shrubs/holly/diseases-of-holly-bushes-pests-and-diseases-damaging-holly-bushes.htm

I would treat with Neem Oil. This works as both an insecticide and fungicide. It is safe for people, pets and bees.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm