Predicting Douglas-fir Defoliation from the Percentage of Buds Infested by the Western Spruce Budworm
AbstractBased on samples from 12 locations collected in British Columbia between 1977 and 1982, a regression model was developed for the relationship between percentage of buds of Douglas- fir, Pseudotsuga menziesii (Mirb.) Franco, infested by western spruce bud worm (WSB), Choristoneura occidentalis (Freeman), and the resulting stand defoliation. This relationship can be used to assess the bud worm population in the early spring , either as a pre-treatment check or to predict damage.
LicenseAuthors who publish with the Journal of the Entomological Society of British Columbia agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).