Probably Fletcher Scale insect...Fletcher Scale

And it is a pain in the you know what. Each of those mature scales has 500 eggs in them. I had an outbreak this year and I manually squished off every single one on my potted plants and then sprayed with malathion. If I had seen the infestation when the plants were dormant I would have used a dormant oil.

Mid-june is when the "crawlers" / hatched eggs will be moving around and feeding. You should do as much as you can to get a grip on that. I found plenty of crawlers also a month ago and I drenched all my plants with that malathion. I will spray all my stock again in mid-June.

Dax

i would use a systemic bayer tree and shrub soil drench product [without fert] .. but i see its restricted in some NY areas ... so you can research systemic scale treatments for shrubs/trees/conifers ....

such would be applied once.. and wipe out mom and potential babes ... and in my experience.. the problem would never return ... but it might take a few years for the dead moms to disappear ...

ken

Check all your landscape plants as it may be on others. Scale is a wreaking problem.

Dax