My holly bush leaves are dying and there are white spots on my branches where the leaves are dying.
Greyish White Spots on My Holly Branches
Certified GKH Gardening Expert
It sounds like it could be scale. This article will help:
We have found neem oil effective on most damaging pests. Here is more information on neem oil: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm