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Twisty Baby Black Locust tree covered in cocoons - Ask Extension

hundreds of leaves on my twisty baby have 1/2" cocoons hanging from the leaves.  Inside is a small black caterpillar.  

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.