Q.Holly Bush
On my holly tree I have some pests that are like grey oval dots of aphids, evenly spaced out along the branches. Also, some leaves have what looks like sooty leaves. Can you help please? HARPER
Certified GKH Gardening Expert
This is most likely aphids or mealy bugs. The black residue is sooty mold, which is caused by the pests. I would treat the plant with neem oil. It is effective against both of these bugs, as well as the sooty mold. Here is more information that may help you:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/plant-problems/pests/mealybugs-white-residue-on-plants-leaves.htm
https://www.gardeningknowhow.com/plant-problems/pests/homemade-aphid-control-a-natural-way-to-kill-aphids.htm
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm
