A few days ago I noticed dozens of small flying insects flying around my arborvitae. They move too fast and are too small to take a picture of but they are about the size and appearance of fungus gnats when flying around so that could be a possibility. You can only make out the wings when they're flying but I think they may have a black body. They're easy to miss if you don't pay attention.
I also noticed them around some yews and could see them in a neighbor's deciduous shrub nearby but I don't know the type.
Don't see them anywhere else.
A bit of snow over the winter and last year. These trees get surrounded by a lot of snow. Last year there was a small amount of leaf loss due to snow. A neighbor lost a small evergreen shrub recently from what looked to me to be disease or insect damage which has me concerned.
Sorry I couldn't be any more descriptive but any help about what flying insects might be attracted to these would be helpful. I sprayed them with neem oil a couple of days ago but today they're back. Will do a couple follow up sprays every week or so.
Update:
Went to check for scale and to be honest not sure what to look for so posting some pics. There's browning on the inside but I always thought that was due to the density on the outside restricting light.
Another odd thing was when I went to check there were only a few insects now. The trees are now in shade and before when I saw them they were in direct sunlight.
Here are the pics if it helps identify anything.