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It's difficult to be certain because this is such a young tree, but the problem could be a canker. Cankers are usually found on the trunk of a tree and are caused by fungi, bacteria, or viruses. They often, but not always, kill a tree. It is possible for one cankerous tree to infect another of the same species, so if I'm right, then your other pawpaw may be ...


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In the north ( eg. Chicago) ,catalpas are often severely pruned and tolerate it well ; so loosing a couple branches will do no lasting harm. I would only clean up the broken stump. Footnote : When I first went birdwatching at High Island TX, It took me awhile to figure what the 75 ft trees with flowers were because I had never seen an un -pruned catalpa ...


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