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Pathogenic Variability Among Populations of the Pinewood Nematode, Bursaphelenchus Xylophilus

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Virulence of populations of Bursaphelenchus spp. associated with conifers varies throughout the range of this nematode in the United States and Japan. Populations of B. xylophilus (pinewood nematode, PWN) from Japanese black and red pine in the same and distantly separated pine stands in Japan range in virulence from 0-100% and there is a tendency for the most virulent populations to be in the northernmost part of the nematode's range where establishment has been relatively recent. Virulence of PWN populations, however, does not vary within a single pine or vector insect. Isozyme patterns are similar between virulent and avirulent populations and therefore cannot be used to differentiate them. Aspartate transaminase isozyme patterns can be used to differentiate between B. xylophilus and B. mucronatus. Pathogenicity of PWN in the United States depends on the interaction of the pine species with different PWN populations, the physiological status of the infected pine, and environmental conditions. Mating and reproductive potential, virulence, DNA sequence differences determined by restriction fragment length polymorphisms, and isozyme differences are useful criteria for studying population biology and genetics of PWN, and when used together, for describing speciation of Bursaphelenchus associated with conifers. For. Sci. 36(4):1061-1076.

Keywords: Genetics; Pinus; isozymes; pathotypes; pinewood nematode

Document Type: Journal Article

Affiliations: Professor and Chair, Department of Biology, Saint Louis University, 3507 Laclede Av., St. Louis, MO 63103-2010

Publication date: December 1, 1990

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  • 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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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