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    How do Phytophthora spp. de Bary kill trees?

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    Fulltext not available
    Authors
    Davison, Elaine
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Davison, Elaine M. 2011. How do Phytophthora spp. de Bary kill trees?. New Zealand Journal of Forestry Science. 41S: pp. S25-S37.
    Source Title
    New Zealand Journal of Forestry Science
    Additional URLs
    http://www.scionresearch.com/__data/assets/pdf_file/0010/34858/NZJFS-41S2011S25-S37_DAVISON.pdf
    ISSN
    1179-5395
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/42696
    Collection
    • Curtin Research Publications
    Abstract

    Phytophthora spp. de Bary are being increasingly recognised as pathogens that cause tree death, without necessarily having any clear understanding of how this happens. Suggested mechanisms include: extensive fine-root necrosis especially on wet or drought prone sites, leading to reduced water uptake, crown decline and death, e.g. Phytophthora quercina T. Jung infection of European oaks; root and stem cankers resulting from phloem invasion and cambial death, leading to death of basal buds and carbon starvation of the root system, e.g. Phytophthora alni Brasier & S.A. Kirk infection of alders; xylem invasion, leading to reduced conduction, hydraulic failure and death, e.g. Phytophthora ramorum Werres, De Cock & Man in ‘t Veld infection of tanoaks; and hormonal imbalance and/or damage from toxins, e.g. Phytophthora cinnamomi Rands infection of eucalypts. These possible mechanisms are reviewed, together with different hypotheses of why trees die, and the predisposing environmental stresses that contribute to tree death. Extensive xylem invasion provides a mechanistic explanation of how death occurs, but is the least frequently reported symptom of Phytophthora infection.

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