Phytophthora cinnamomi causing stem canker and root rot of nursery-grown Platanus × acerifolia: first report in the Northern emisphere
Pilotti, M.; Di Lernia, G.; Lumia, V.; Riccioni, L.
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Firenze University Press
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Lethal stem and root cankers were observed in nursery-grown Platanus × acerifolia trees in Rome. Externally, canker lesions appeared as bluish or blackish areas starting from the stem base and extending upward.
Inner bark was necrotised. In some cases an irregularly-shaped callus reaction attempted to heal the bark lesions.
Black-stained necrosis affected the primary roots and the small branch roots to different degrees. The presence of
Ceratocystis platani was excluded in the diseased trees. Phytophthora-like organisms were isolated from the altered
tissue. Morphological and ITS-region-based analyses identified the isolates as Phytophthora cinnamomi. A pathogenicity
test confirmed P. cinnamomi as the causal agent of the disease here defined as: stem canker and root rot of
plane tree. This is the first report of P. cinnamomi in Platanus spp. in the Northern emisphere.