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Photo#1858264
American Chestnut larvae

American Chestnut larvae
Millcreek Township, Lebanon County, Pennsylvania, USA
July 19, 2020
We have 3 American Chestnut saplings raised from an extraordinary tree that survived the blight. Yesterday I found these larvae. I raise native plants to support the animals that rely on them... but these guys are voracious, and if they're not themselves at risk, I'd prefer that they not kill my tree. I could maybe move them to another host plant. They move across the surface of the leaf, leaving behind a single crispy layer and tremendous amounts of frass (shown in second photo).

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American Chestnut larvae American Chestnut larvae American Chestnut larvae American Chestnut larvae

Not an ID
But I suspect (from what I can see) these are notodontid caterpillars, perhaps in the genus Datana.

 
thanks!
Datana certainly looks likely. They've stopped eating and clustered on the underside of a leaf. Maybe later instars will make for a better ID, because I haven't found anything that looks exactly like these...

 
You might also try
You might also try various oaks as alternate food sources to spare your trees (not that a defoliation will necessarily do them much harm, though I'm not sure on that point).

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