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All agreed the blight seemed to be attacking a particular root stock of dwarf trees, which are widely grown because they are more compact and yield fruit more quickly. Commonly, problems with the trees seemed to start at the graft
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In Pennsylvania, the issue usually occurs on Mulling 9 rootstock, widely known as M.9, Peter said. The problem has been identified on similar rootstock in New York, North Carolina, and New Jersey. The rootstock remains healthy, but the disease attacks the trunk of the tree. Leaves begin to turn yellow, then red. Within weeks, a tree can die and collapse, loaded with fruit.
This is good to know. Luckily, for me, it’s not hitting M111.