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?
Holly Tree Insect/Disease
Certified GKH Gardening Expert
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: