holly bush leaves have black spots, and are yellow and falling

Question

Why does the above happen? What can we use?

Answer 1

This disease could be something called tar spot. This article will tell you more: https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-problems-holly-leaf-spot-or-holly-tar-spot.htm
Of course, there are many diseases that can afflict holly, which you might want to be aware of: https://www.gardeningknowhow.com/ornamental/shrubs/holly/diseases-of-holly-bushes-pests-and-diseases-damaging-holly-bushes.htm
To be sure what the problem is you an take some leaves to the Extension Service. This link will help you locate one: https://www.gardeningknowhow.com/extension-search/