Canadian Forest Service Publications

A 90-year sea warming trend explains outbreak patterns of western spruce budworm on Vancouver Island. 2007. Thomson, A.J.; Benton, R.A. The forestry Chronicle 83(6): 867-869.

Year: 2007

Issued by: Pacific Forestry Centre

Catalog ID: 28036

Language: English

CFS Availability: PDF (request by e-mail)

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Abstract

Three outbreaks of western spruce budworm were recorded on southern Vancouver Island between 1909 and 1930. After 1930, outbreaks were restricted to interior regions of British Columbia. We show that warming winter temperatures on southern Vancouver Island, related to warming sea temperature, promoted earlier larval emergence while the timing of bud flush has remained constant. This differential response to changed climate has resulted in a significant departure from optimal phenological synchronization that would explain the outbreak history.