Can you isolate a branch against a solid background, perhaps piece of cardboard, so that the branch will be in focus?

Branch picture

Thanks for trying. Can you see that the focus is on the board *behind" the branches? You should have sort of "bracket" that is outlined to show you where the focus is.

Anyway, looks rather like aphids, mealybugs, or a cottony scale.

Can you wash them off with a harsh water spray? If so, do so and repeat as needed.

If not, I suggest you take a sample infested branch to your county's Extension Service office.
Locate your office with the interactive map at the link below...

Here is a link that might be useful: Locate your county's Extension Service office