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Nematode-Induced Pine Wilt Disease: Factors Influencing Its Occurrence and Distribution

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Bursaphelenchus xylophilus, pinewood nematode, and B. mucronatus are members of the pinewood nematode species complex (PWNSC) from forested areas of the northern hemisphere. In the presence of suitable vectors, pathogenic forms of the PWNSC cause pine wilt disease in susceptible tree species in very warm climates. Pine wilt disease is expressed rarely in the northern hemisphere outside of Japan and south China. The disease is expressed only where susceptible pines have been introduced into environments warmer than their natural climatic range, or where pathogenic isolates of the PWNSC have been introduced into warm climates containing susceptible tree species. It is probable that the pine wilt epidemic in Japan is a result of a pathogenic form of the PWNSC being introduced around the turn of the century. Pine wilt disease has not been recorded for any part of North America, Europe, or Asia where mean daily summer temperatures are 20°C or below regardless of the presence of susceptible trees or pathogenic PWNSC isolates. Some PWNSC isolates from northern regions of Europe and North America move and reproduce more rapidly at lower temperatures than do PWNSC isolates from warmer climates. These characteristics may be factors that contribute to the differences in pathogenicity of different isolates of the PWNSC to different pine species. For. Sci. 36(1):145-155.
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Keywords: Bursaphelenchus xylophilus; climate; epidemiology; geographic distribution; pathogenicity; species complex

Document Type: Journal Article

Affiliations: Centre for Pest Management, Simon Fraser University, Vancouver, B.C., Canada, V5A 1S6

Publication date: 1990-03-01

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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