Does anthracnose spread to other trees?
No. anthracnose doesn't move tree to tree in a way that makes your other trees a worry. Almost never fatal on an established tree. It looks alarming, the tree defoliates, and then it leafs back out. Most calls about it don't need a treatment at all.
What to check
Brown blotches along leaf veins, early leaf drop, sometimes twig dieback. Worst after a cool wet spring.
Indiana specifics
Very common here in wet springs, particularly on sycamore. One of the most over-treated problems in the trade.
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