Pear blight (bacterial) is not specific but I think that the American Chestnut blight might be. It survives in old forests where roots still remain after all these years, throwing up new growths that grow for a time, then succumb and die. I really don't know if any other trees or plants have ever suffered from the fungus. I have other nut trees, fruit trees, berries, herbs and quite a few houseplants but I have never had any problems. I was concerned when one of the 'chocolate trees' arrived with a die-back fungus but even the other Theobroma cacao didn't suffer any harm. It is possible that they were two different types of cacao trees.
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