I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
That sounds like fire blight infection. This is primarily a spring problem and should not reappear this summer or fall. Prune out all dead shoots cutting back about 6 inches past the line between living and dead. Dip pruners in rubbing alcohol between cuts. Avoid adding fertilizer which increases vigor and promotes the disease.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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