We had these trees treated 2 times for woolly adelgid after we moved in last year and they were treated again this year. Now they have developed brown/yellow leaves.

Close up of top and bottom.

These had new growth this year and the leaves are not falling off.

Any ideas what this might be?

I really don't want to lose the trees. We have large oak in the rear of the property that has Oak Wilt that will be taken done in November and that will cost a ton of $. We had the surrounding oak injected with a fungicide and they will trench before removing the infected tree.

The hemlocks are not too far from the infected oak and those that were treated. Could this be related?