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Caterpillars on an ash tree - Ask Extension

I was cutting a rouge ash tree in my peonies and found these caterpillars. What are they and do the pose a threat to other plants?

This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.