Will these branches die.

[johnl445]

Hello friends, I have an older established Japanese black plane and have been struggling to stay ahead of fungus this year. All the trees in my neighborhood have been suffering from fungus, and even though I was thorough with the fungicide rotation on my trees, it’s still was able to weaken some of the smaller/thinner branches on my tree. We recently had a lot of wet weather, and that only made matters more difficult.

If the needles on the branch turn yellow, but there still happens to remain a healthy bud , will the branch automatically die or is there a chance the branch will survive next spring?

 

[Shibui]

There's always a chance of a branch making it through to Spring but survival will depend how badly the branches are affected, what other stresses the tree faces from now to Spring and a host of other factors.

What is the fungus your trees have/had? Needle blight and root rot are the only 2 fungal problems we seem to suffer down here and both seem reasonably easy to stop. What parts of the trees are affected by the infection and how does it show up?
I don't know Boston weather or climate but there should be some remedy other than fungicide treatment. Just wondering what else you've tried?

How likely those branches survive will depend on many factors - what part of the tree (no overall photo to ascertain general tree health or relative strength of the branches), whether you've managed to control the original problem, etc, etc.