I just noticed a white, fuzzy-looking substance on the branches of three of my 'Blue Princess' holly bushes. On one shrub, one of the branches that is covered with this substance has died. I cannot tell if it is an insect infestation or some kind of fungus. Is anyone familiar with this problem? Can you please tell me what it might be and what to do to control the problem? I don't want to lose these three shrubs.
White Substance on Holly Branches
Certified GKH Gardening Expert
It sounds like it might be mealybug. This article will help with that:
If it's powdery in nature, however, then it could be powdery mildew. Here is more information: https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm