lumps in poplar branches - three causes...
- Poplar Twig Gall Fly - Euhexomyza schineri
Small Poplar Borer - Saperda populnea
picture and description of the poplar gall caused by the beetle...
https://tidcf.nrcan.gc.ca/en/insects/factsheet/1002?wbdisable=true- Corky Bark Disease - Diplodia tumefaciens
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