I have 3 Dapped Willow bushes that have been in place for approximately 6-7 years. They are near a downspout so they receive a lot of water which has done well for them all the years. I noticed this spring that they did not fill out with leaves as much as in prior years. After taking a closer look I found many branches dead and some snapped off the base of the trunk very easily. When I cut the dead ones, I noticed a ring - reddish color in the bark (see photo). I didn't see this when I cut a healthier branch. Other symptoms I noticed - there is a lot of moss on the ground - more than I have ever seen so I don't know if that played a role. I am worried with the amount of branches (close to 1/2) that are bad, that it is dying. Is there anything you can see or ideas for how I might be able to save them? Thanks