01694nas a2200193 4500008004100000245012400041210006900165260001600234300001400250490000700264520106900271653001201340653002101352653001301373653002401386100001901410700001601429856005501445 2010 eng d00aPathogenicity of Phytophthora austrocedrae on Austrocedrus chilensis and its relation with mal del ciprés in Patagonia0 aPathogenicity of Phytophthora austrocedrae on Austrocedrus chile cAugust 2010 a604–6120 v593 a

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.

10acypress10aforest pathology10aroot rot10asoilborne pathogens1 aGreslebin, A G1 aHansen, E M uhttp://dx.doi.org/10.1111/j.1365-3059.2010.02258.x