During the 2009 and the 2010 growing seasons, a root rot disease has been detected on young potted Persea americana plants in two nurseries located in the Catania and Messina provinces (eastern Sicily, Italy). A Cylindrocarpon sp. was consistently recovered from pieces of symptomatic tissues on Petri dishes containing potato dextrose agar. On the basis of morphological characteristics and molecular identification by DNA sequencing and phylogenetic analysis of internal transcribed spacer and b-tubulin gene regions, the causal agent was identified as Ilyonectria (=Neonectria) macrodidyma. Kochs postulates were fulfilled by pathogenicity tests carried out on potted P. americana seedlings. To our knowledge, this is the first to report worldwide of the occurrence of a disease caused by I. macrodidyma on P. americana.

First report of root rot caused by Ilyonectria (Neonectria) macrodydima on avocado (Persea americana) in Italy

VITALE, ALESSANDRO;POLIZZI, Giancarlo
2012-01-01

Abstract

During the 2009 and the 2010 growing seasons, a root rot disease has been detected on young potted Persea americana plants in two nurseries located in the Catania and Messina provinces (eastern Sicily, Italy). A Cylindrocarpon sp. was consistently recovered from pieces of symptomatic tissues on Petri dishes containing potato dextrose agar. On the basis of morphological characteristics and molecular identification by DNA sequencing and phylogenetic analysis of internal transcribed spacer and b-tubulin gene regions, the causal agent was identified as Ilyonectria (=Neonectria) macrodidyma. Kochs postulates were fulfilled by pathogenicity tests carried out on potted P. americana seedlings. To our knowledge, this is the first to report worldwide of the occurrence of a disease caused by I. macrodidyma on P. americana.
2012
fungal plant pathogen, Cylindrocarpon macrodydimum, pathogenicity, identification, Italy
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/245270
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