A friend of mine has two well established Holly bushes (over 20 yrs old). They both have a white, rice shaped thing stuck to the leaves (kind of bug or disease). They are infested. I sprayed 4 times with Malathion. It does not seem to be doing much. Do you know what it is and how do I treat it? She wants to save them if she can. Nothing else around it seems to be infected.
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: