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[Alan Haigh <alandhaigh@gmail.com>]

I have planted black raspberries on several sites around southeastern NY over the years and they've always burned out after 4-6 years.  My recollection of my research at the time was that this was considered normal and probably the result of virus.  No one suggested winter-kill.  The advice was to eliminate all nearby wild brambles, but I didn't find that to be a solution.