Adelges piceae (Balsam Wooly Adelgid)
A minor pest of true firs in Europe. A bigger problem for North American fir species.
Wild alpine and silver firs are very susceptible and can be killed by outbreaks. It’s present on many landscape firs growing in people’s yards around here since most of those are collected, not grown in nurseries.
Noble fir are more resistant to the insect, yet here it is on one of my noble firs.

Gouging caused by the insect.

A woolly wax coating protects them. That can be scraped off revealing the darker insect beneath.

This one has produced little brown eggs. Those will hatch soon. The crawlers will emerge, find a site to attach and start to wool-over for winter.
The plan is to inspect my other firs and administer Bioadvanced Tree and Shrub systemic granules (Imidacloprid 1.1%). I believe that now and Spring are the best times for treatment.