Holly Leaf Drop

Question

My two Holly trees are developing a reddish color on one side of the leaf and what look like reddish purple spots on the other side. Can you advise me on a solution to the problem?

Answer 1

This article should help pinpoint the problem:
https://www.gardeningknowhow.com/ornamental/shrubs/holly/diseases-of-holly-bushes-pests-and-diseases-damaging-holly-bushes.htm