Plum and pear fungus (or something) ID and Treatment?

[mamuang]

On Plum is definitely Black Knot.

Black knot

In general, I don’t have big black knot problem in my yard, found one on plum in past 10 years. But I found two today on different plum trees. Out if curiosities, I cut the branch open to take a look what it did to the wood underneath. BTW I bleached knife, cutting surface, also soaked the branch and little pieces in bleach before I toss them into garbage. Here is what it looks like. [IMG_20210322_171010_edit_395422626368306] [IMG_20210322_171109_edit_395449080136010] [IMG_20210322…

The pear pic was not in focus. It is hard to tell.