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Severe Outbreak of Pseudomonas syringae pv. avellanae on Hazelnut in Italy
Author(s) -
Scortichini M.,
Troplano F. G.
Publication year - 1994
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1994.tb00177.x
Subject(s) - biology , pseudomonas syringae , chlorosis , inoculation , cambium , horticulture , blight , outbreak , xanthomonas campestris , pseudomonas , canker , botany , bacteria , citrus canker , microbiology and biotechnology , pathogen , xylem , genetics , virology
Pseudomonas syringae pv. avellanae , the causal agent of bacterial canker of hazelnut, has been isolated for the first time in Italy. Biochemical tests were consistant with the type‐strain of the microorganism and whole‐cell protein profiles of the studied isolates were similar to those of the type‐strain. When artifically inoculated, either in summer or in autumn, the isolates incited the same symptoms as those observed in the field. The main symptoms are the failure of the buds to swell or their withering after breaking in spring; the chlorosis of the foliage and rapid withering of the leaves that remain attached on the twigs during summer; dark brown discolouration of the bark and cambium, necrosis in the primary roots and the final dieback of the plant. The pathogen killed more than 1,800 adult hazelnut plants in one orchard within a period of five years. The main differences of the symptomatology between bacterial canker and bacterial blight of hazelnut, caused by Xanthomonas campestris pv. corylina , and the “seccume” of the hazelnut are briefly discussed.