Canadian Forest Service Publications

EHLDSS - A decision support system for management of the eastern hemlock looper. 1995. Carroll, A.L.; Hudak, J.; Meades, J.P.; Power, J.M.; Gillis, T.; McNamee, P.J.; Wedeles C.H.R.; Sutherland, G.D. Pages 807-824 in J.M. Power, M. Strome, and T.C. Daniel, compilers and editors. Proceedings Decision Support - 2001 Combined events of the 17th Annual Geographic Information Seminar and the Resource Technology '94 Symposium, September 12-16, 1994, Delta Chelsea Inn, Toronto, Ontario. American Society for Photogrammetry and Remote Sensing, Bethesda, Maryland.

Year: 1995

Available from: Pacific Forestry Centre

Catalog ID: 19567

Language: English

CFS Availability: Order paper copy (free)


A project was initiated in 1988 to develop a decision support system to facilitate integrated management of eastern hemlock looper (EHL), Lambdina fiscellaria fiscellaria (Guen.), populations across insular Newfoundland, Canada. Individual models were developed to predict probabilities of defoliation, timber mortality and decay, risk of impending outbreaks and larval phenology. Models and data were embedded in a geographic information system (ARC/INFO®) and linked to a menu-driven, graphical user interface. The eastern hemlock looper decision support system (EHLDSS) generates predictions of probabilities of initial and continued defoliation, timber mortality and decay based on forest stand characteristics and past and present EHL population levels. To support management decisions, each prediction run can be modified based on stand eligibility for control tactics, expected efficacies of various control measures, and acceptable mortality and decay volume thresholds. Results of predictions can be viewed at either the map section or stand level of resolution. Future versions of EHLDSS will include links to timber supply projection models and incorporate economic analyses and indicators.

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