Canadian Forest Service Publications

Pest management of Douglas-fir tussock moth: procedures for insect monitoring, problem evaluation and control actions. 1986. Shepherd, R.F.; Otvos, I.S. Agriculture Canada, Ministry of State for Forestry and Mines, Pacific Forestry Centre, Victoria, BC. Information Report BC-X-270. 14 p.

Year: 1986

Issued by: Pacific Forestry Centre

Catalog ID: 2563

Language: English

Series: Information Report (PFC - Victoria)

Availability: Order paper copy (free), PDF (download)

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Procedures are described for detecting impending outbreaks of Douglas-fir tussock moth, Orgyia pseudotsugata (Lepidoptera: Lymantriidae). Areas susceptible to outbreaks are determined by overlaying maps of past outbreaks onto maps of forest types, plant communities and climatic zones. The time and location of the next outbreak is indicated by monitoring annual trends of moth density with pheromone traps. Pockets of high population are confirmed by ground reconnaissance. Sequential egg-mass and larval sampling systems are used to determine insect density and predict defoliation for the next year. Advantages and disadvantages of the various control measures are discussed and examples are given for different situations.