Caneberry stem cut open to reveal a larva of raspberry cane maggot, Pegomya rubivora (center), and its tunnel packed with its brown, granular frass (excrement).

Caneberry stem cut open to reveal a larva of raspberry cane maggot and its tunnel packed with its brown, granular frass (excrement).; Maine Credit: Bruce Watt, University of Maine, Bugwood.org<br />Licensed under a <a href="https://creativecommons.org/licenses/by-nc/3.0/us/">Creative Commons Attribution-Noncommercial 3.0 License</a>
Credit: Bruce Watt, University of Maine, Bugwood.org
Licensed under a Creative Commons Attribution-Noncommercial 3.0 License