Overview of the main wood-decay fungi in the mountain areas of the Veneto: Wood-decay fungi are an important component of forest ecosystems, because involved in the decomposition of wood and in the formation of the soil. However, some species can act as plant pathogens causing severe diseases. Recently, severe outbreaks caused by different species has been observed in some mountain areas of the Veneto especially on European Spruce (Picea abies). In consideration of the limited information on the geographic distribution and diversity of these fungi in Veneto, during the spring and summer of 2023 a study was conducted in five sites distributed in five mountain areas of Veneto region (from Prealps to Dolomites), in the altimetric range 1000 and 1800 m a.s.l. In order to estimate the disease incidence on various woody hosts, different linear transects (50 m long) were set up in each site to evaluate the presence of symptoms and signs (fruit bodies). A total of 90 samples which included basidiomes, rhizomorphs, wood and mycelium were collected from 4 plant species and analysed in laboratory. On the basis of morphological characteristics and sequence data of the ITS region of the rDNA, ten species have been identified: Heterobasidion parviporum (26), Armillaria cepistipes (19), Ganoderma applanatum (12), Fomes fomentarius (8), Fomitopsis pinicola (5), Trametes versicolor (5), Armillaria mellea (3), Postia stiptica (3), Lenzites betulina (3), Trametes gibbosa (2). In addition, some natural antagonists, belonging to genres Hypomyces e Trichoderma have been obtained. The results have allowed to expand the knowledge about the diffusion and diversity of fungal species associated to wood-decay in the mountain areas of Veneto. In particular, the investigations have highlighted a high incidence of attacks by A. cepistipes and H. parviporum in spruce plantations, especially in the areas impacted by the Vaia storm.
Panoramica sui principali agenti di carie del legno nelle aree montane del Veneto: I funghi lignicoli agenti di carie e alterazione del legno rappresentano un’importante componente degli ecosistemi forestali, in quanto partecipano alla decomposizione del legno e alla formazione del suolo. Tuttavia, alcune specie possono agire come parassiti causando gravi alterazioni anche su alberi sani. Recentemente, è stata osservata una recrudescenza degli attacchi di questi organismi, in particolare nei boschi di abete rosso, in alcune aree montane del Veneto. In considerazione delle poche informazioni disponibili sulla distribuzione geografica e la biodiversità di questi organismi basidiomiceti in Veneto, tra la primavera e l’estate del 2023 è stato condotto uno studio in 5 aree montane tra il Pian del Cansiglio e il Cadore (nella fascia compresa tra i 1000 e i 1800 m s.l.m). Al fine di stimare l’incidenza dei sintomi di carie sulle diverse specie arboree sono stati allestiti dei transetti lineari di 50 m all’interno dei quali è stata rilevata la presenza di sintomi e segni (basidiomi). Nel corso delle indagini sono stati raccolti da 4 specie vegetali 90 campioni che includevano basidiomi, rizomorfe, legno e micelio. Sulla base delle caratteristiche morfologiche e dei dati di sequenza della regione ITS dell’rDNA, sono state identificate 10 specie: Heterobasidion parviporum (26), Armillaria cepistipes (19), Ganoderma applanatum (12), Fomes fomentarius (8), Fomitopsis pinicola (5), Trametes versicolor (5), Armillaria mellea (3), Postia stiptica (3), Lenzites betulina (3), Trametes gibbosa (2). Inoltre sono stati isolati alcuni antagonisti naturali appartenenti ai generi Hypomyces e Trichoderma. I risultati hanno permesso di ampliare le conoscenze sulla diffusione e la diversità di specie fungine agenti di carie nelle foreste montane del Veneto. In particolare, le indagini hanno evidenziato una elevata incidenza di attacchi di Armillaria cepistipes e Heterobasidion parviporum nelle piantagioni di abete rosso, soprattutto nelle aree interessate dagli schianti della tempesta Vaia.
Panoramica sui principali agenti di carie del legno nelle aree montane del Veneto
SAVIO, LUCA
2022/2023
Abstract
Overview of the main wood-decay fungi in the mountain areas of the Veneto: Wood-decay fungi are an important component of forest ecosystems, because involved in the decomposition of wood and in the formation of the soil. However, some species can act as plant pathogens causing severe diseases. Recently, severe outbreaks caused by different species has been observed in some mountain areas of the Veneto especially on European Spruce (Picea abies). In consideration of the limited information on the geographic distribution and diversity of these fungi in Veneto, during the spring and summer of 2023 a study was conducted in five sites distributed in five mountain areas of Veneto region (from Prealps to Dolomites), in the altimetric range 1000 and 1800 m a.s.l. In order to estimate the disease incidence on various woody hosts, different linear transects (50 m long) were set up in each site to evaluate the presence of symptoms and signs (fruit bodies). A total of 90 samples which included basidiomes, rhizomorphs, wood and mycelium were collected from 4 plant species and analysed in laboratory. On the basis of morphological characteristics and sequence data of the ITS region of the rDNA, ten species have been identified: Heterobasidion parviporum (26), Armillaria cepistipes (19), Ganoderma applanatum (12), Fomes fomentarius (8), Fomitopsis pinicola (5), Trametes versicolor (5), Armillaria mellea (3), Postia stiptica (3), Lenzites betulina (3), Trametes gibbosa (2). In addition, some natural antagonists, belonging to genres Hypomyces e Trichoderma have been obtained. The results have allowed to expand the knowledge about the diffusion and diversity of fungal species associated to wood-decay in the mountain areas of Veneto. In particular, the investigations have highlighted a high incidence of attacks by A. cepistipes and H. parviporum in spruce plantations, especially in the areas impacted by the Vaia storm.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/54104