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Rough bark and frass in crevices and around the tree base caused by larvae of the sycamore borer, Synanthedon resplendens.

Boring dust around base of tree with roughened bark, South Coast Field Station, Orange Co. Credit: Jack Kelly Clark
Rough bark and frass in crevices and around the tree base caused by larvae of the sycamore borer, Synanthedon resplendens. Credit: Jack Kelly Clark
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