Holly Tree Nodules
What are the nodules on Holly Tree branches? They seem to exhude a glossy substance that looks like something has been sprayed with varnish. Is this a natural thing or something damaging to the tree? What, if anything, is any treatment?
Certified GKH Gardening Expert
It sounds like you may have pests, perhaps scale or mealybugs. I would recommend neem oil. I have found it to be very effective against these pests. Here is more information on it: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm For additional information on scale bugs, which commonly affect these plants, here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm