Holly Tree Insect/Disease

Question

My holly tree has what looks like mud on many of the leaves. On the back of the leaves are white rectangular things, which look like a broken piece of spaghetti–possibly 1/8 in wide and about 1 inch long. What is this? What should I do about it?

Answer 1

It is possible that it is scale or mealybugs. I like to treat both with neem oil. It is very effective and safe. These articles will help:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/mealybugs-white-residue-on-plants-leaves.htm