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Soil compaction and chestnut ink disease

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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 × 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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Language: English

Document Type: Research Article

Affiliations: 1: Centro de Estudos em Gestão de Ecossistemas/Departamento Florestal, Universidade de Trás-os-Montes e Alto Douro, Apartado 1013, 5001-911 Vila Real, Portugal 2: USDA Forest Service, Southern Research Station, Asheville, NC, USA

Publication date: 2004-08-01

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