Garden Pests and Diseases: White spots on boxwoods.. Aphids? Please Help!, 1 by TuolumneNick

TuolumneNick wrote:
I am taking care of my elderly Mom's place in the San Francisco East -Bay Area. She has a Fuji Apple tree that I noticed has this white fuzzy/fluffy fungus looking stuff on it (please see photo). I showed her the photo (she is 92) and her response was "I have seen that before on that tree" (she was quite the gardener in her day) but that was as far as she could go. I don't want to lose her beloved Fuji...any suggestions? It is only on one large branch and shoots on one side of the tree....Thanks!