There are 3 "mountain ash" and most likely more. Euro. Mount ash, Sorbus aucuparia; Greene Mount Ash, Sorbua scopulina; and Sitka Mount ash, Sorbus sitchensis. Around here ash get what we call "ash die off", limbs just die back. But in the US we have all sorts off weather issues right now. In Calif it is so hot and dry our poor blue oaks are already dropping leaves, they usually hold them until Aug. So, yeah more info, and pictures would be helpfull.
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