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.
|Autori:||Pilotti, M.;Di Lernia, G.;Lumia, V.;Riccioni, L.|
|Data di pubblicazione:||2014|
|Titolo:||Phytophthora cinnamomi causing stem canker and root rot of nursery-grown Platanus × acerifolia: first report in the Northern emisphere|
|Appare nelle tipologie:||1.1 Articolo in rivista|