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A New Simulator for the Spread of Forest Root Diseases by Individual Root Contacts

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A new simulator for the spread of forest root diseases, and the testing of it, is presented. It differs from earlier models in that it represents a first step to incorporate the basic processes of spread by individual root contact. It therefore has a generality that allows its use in different host–pathogen and geographic situations. It stochastically grows individual roots longitudinally outward from the stem. They are tapered, turn, and contact other roots as they grow. The simulator transfers fungus stochastically at points of contact between healthy roots and infected stump or tree roots and moves the fungus along infected tree roots stochastically. The fungus can girdle the rootcollar, move out into other roots, and eventually kill the tree. Growth of roots and fungus movement along infected roots is on an annual basis for up to 200 years. Root growth, fungus growth along roots, disease spread, and stand openings are displayed dynamically in color on the computer screen as the simulation proceeds. Estimates for numbers of infected trees and mortality are provided in tabular and graphical form. Results from the simulator were close to the field data it was tested against. FOR. SCI. 51(5):425–437.
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Keywords: Armillaria; Phellinus; Simulation; Tomentosus; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; model; natural resource management; natural resources

Document Type: Regular Article

Affiliations: 1: Research Scientist Pacific Forestry Centre, Canadian Forest Service, Natural Resources Canada 506 West Burnside Road Victoria BC Canada V8Z 1M5 Phone: (250) 363-0780;, Fax: (250) 363-0775, Email: 2: Research Scientist Pacific Forestry Centre, Canadian Forest Service, Natural Resources Canada 506 West Burnside Road Victoria BC Canada V8Z 1M5 Phone: (250) 363-0640, Email:

Publication date: 2005-10-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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