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    Author(s): T.F. Fonseca; C.G. Abreu; B.R. Parresol
    Date: 2004
    Source: For. Path., Vol. 34: 273-283
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (128 KB)

    Description

    Chestnut ink disease caused by the oomycete Phytophthora cinnamomi, a soil-borne pathogen of world-wide distribution, accounts for the majority of disease problems on chestnuts in Portugal, limiting yield in a large number of stands and impeding establishment of trees in new areas. A survey was carried out in 32 chestnut stands in the Padrela Mountains of northern Portugal to investigate the relationship among ink disease occurrence, edaphic factors and management practices. A logistic regression function was employed to analyze the effect of soil attributes and management practices on the stand health status. Results showed that the main factors affecting disease were soil compaction (COMP), soil organic matter level (OM) and manuring practice (MA). A logistic model containing the soil variable COMP and the interaction term OM ยท MA correctly predicted the stand health status in 94%, or 30, of the 32 stands studied. The logistic function coefficients indicate that the probability of a stand having ink disease increases with increasing soil compaction and increasing soil organic matter content in stands where manuring is the usual practice.

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    Citation

    Fonseca, T.F.; Abreu, C.G.; Parresol, B.R. 2004. Soil compaction and chestnut ink disease. For. Path., Vol. 34: 273-283

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