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Bark swelling and frass on a poplar tree branch infested with western poplar clearwing, Paranthrene robiniae.

Bark swelling and frass on a poplar tree branch infested with western poplar clearwing, Paranthrene robiniae. A small twig killed by the boring larva.; Kern County, California Credit: John F. Karlik — Credit: John F. Karlik

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