Choristoneura occidentalis biennis(CHONBI)
Distribution details in Canada (Alberta)
Current pest situation evaluated by EPPO on the basis of information dated
2015: Present, no details
* Furniss RL, Carolin VM (1977) Western Forest Insects. USDA , Forest Service Miscellaneous Publication no. 1339, 654 pp.
* Government of Canada (2015-08-04) Trees, insects and diseases of Canada's forests. Two-year-cycle budworm. https://tidcf.nrcan.gc.ca/en/insects/factsheet/12015
* Government of Canada (2015-08-04) Trees, insects and diseases of Canada's forests. Two-year-cycle budworm. https://tidcf.nrcan.gc.ca/en/insects/factsheet/12015