Choristoneura occidentalis biennis(CHONBI)
Distribution details in Canada (British Columbia)
Current pest situation evaluated by EPPO on the basis of information dated
2015: Present, restricted distribution
* 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
* Nealis V (2005) Diapause and voltinism in western and 2-year cycle spruce budworms (Lepidoptera: Tortricidae) and their hybrid progeny. The Canadian Entomologist 137, 584-597.
------- Restricted to the interior of British Columbia.
* 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
* Nealis V (2005) Diapause and voltinism in western and 2-year cycle spruce budworms (Lepidoptera: Tortricidae) and their hybrid progeny. The Canadian Entomologist 137, 584-597.
------- Restricted to the interior of British Columbia.