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A swollen branch cut open to reveal a tunnel packed with the frass (excrement) of a larva of the poplar and willow borer, Cryptorhynchus lapathi, a weevil.

A swollen branch cut open to reveal a tunnel packed with the frass (excrement) of a larva of the poplar and willow borer, a weevil.; Hungary Credit: Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org<br />Licensed under a <a href="https://creativecommons.org/licenses/by/3.0/us/">Creative Commons Attribution 3.0 License</a>
Credit: Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org
Licensed under a Creative Commons Attribution 3.0 License
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