Pathogenicity of Phytophthora austrocedrae on Austrocedrus chilensis and its relation with mal del ciprés in Patagonia

Field observations, isolations and pathogenicity tests were performed on Austrocedrus chilensis (Cupressaceae) trees to determine the pathogenicity of Phytophthora austrocedrae and its role in the aetiology of the cypress disease mal del ciprés (MDC) in Argentina. It was found that P. austrocedrae i...

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Bibliographic Details
Published in:Plant pathology 2010-08, Vol.59 (4), p.604-612
Main Authors: Greslebin, A.G, Hansen, E.M
Format: Article
Language:English
Subjects:
Austrocedrus chilensis
Bark
Biological and medical sciences
Collars
Cupressaceae
Cupressus
cypress
Flooding
forest pathology
Forests
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Inoculation
Mortality
Pathogenicity
Pathogens
Phytopathology. Animal pests. Plant and forest protection
Phytophthora
root rot
Roots
Seedlings
soilborne pathogens
Trees
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Summary:Field observations, isolations and pathogenicity tests were performed on Austrocedrus chilensis (Cupressaceae) trees to determine the pathogenicity of Phytophthora austrocedrae and its role in the aetiology of the cypress disease mal del ciprés (MDC) in Argentina. It was found that P. austrocedrae is a primary pathogen of A. chilensis. It was isolated from large necrotic lesions in the inner bark, and superficially in the sapwood, at the root collar and stem, in most of the MDC-affected stands surveyed along the range of A. chilensis in Argentina. The main symptom in naturally infected trees was a necrotic lesion extending from killed roots up to 1 m up the tree bole. Seedlings, saplings and adult trees were all susceptible to inoculation with P. austrocedrae. Under favourable experimental conditions (flooding), inoculated seedlings suffered massive mortality in less than a month. The importance of diseases caused by Phytophthora spp. in South American forests is discussed.
ISSN:0032-0862
1365-3059
DOI:10.1111/j.1365-3059.2010.02258.x