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Canker and dieback on P latanus x acerifolia caused by D iaporthe scabra
Author(s) -
Grasso F. M.,
Marini M.,
Vitale A.,
Firrao G.,
Granata G.
Publication year - 2012
Publication title -
forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 1437-4781
DOI - 10.1111/j.1439-0329.2012.00785.x
Subject(s) - biology , conidium , canker , pycnidium , botany , internal transcribed spacer , inoculation , ribosomal dna , pathogenicity , horticulture , ribosomal rna , phylogenetic tree , microbiology and biotechnology , gene , biochemistry
Summary Cankers and dieback on L ondon plane caused by D iaporthe scabra have been observed in urban plantings in C atania, I taly. Symptoms were delayed spring flush, trunk cankers, small chlorotic leaves associated with dead terminal or lateral branches and an early defoliation. Isolations from infected wood on PDA led to the isolation of the anamorph P homopsis scabra with α‐conidia production. The infected wood placed in a moist chamber developed pycnidia with α and β conidia and perithecia of the teleomorph D . scabra . Sequence analysis of the internal transcribed spacers ITS 1 and ITS 2, the ribosomal intragenic spacer beta‐tubulin 1 and beta‐tubulin 2 genes, congruently indicated that the D . scabra isolate is phylogenetically related to two strains of D . helianthi isolated in I taly from sunflower and to strains of D . eres . Inoculations on young plants of L ondon plane growing in pots confirmed the pathogenicity of the isolated fungus. To our knowledge, this is the first report of the disease in I taly.