I was pruning my holly bushes, and under all the leaves was this white substance, not actually round, which then came to a point and there was a spot of black. Just wondering what it was.
White Substance Under Holly Leaf
Certified GKH Gardening Expert
It sounds like it might be mealybug. This article will help with that:
Neem oil should help. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm