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I remember seeing an abandoned orchard once and
someone said that the trees got oak rot or something like that. I've read
since that when apple trees are planted on ground where Armillarea was in the
oaks, they will grow till they get it too. If you take them out and try
really hard to remove the roots, the next batch of trees will grow fine till
they finally get their roots down deep enough to find the fungus, and then they
die too. There are some pear rootstocks that are pretty resistant to this,
others succumb easily. I think Winter Nelis is the resistant one.
It's susc to blight, so plant it with the union at or below ground. Donna
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