First report of charcoal disease caused by Biscogniauxia mediterranea on Olea europaea in Tunisia

Gharbi, Yâakoub; Ennouri, Karim; Bouazizi, Emna; Cheffi, Manel; Triki, Mohamed Ali

doi:10.1007/s42161-020-00531-4

Cited by 4 publications

(6 citation statements)

References 4 publications

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“…This is the case of the new species Phaeomoniella oleae , which was originally isolated from black-discolored xylem of wilting branch of a plant infected by X. fastidiosa [ 49 ], as well as Conyozyma leucospermi , Nigrospora oryzae and Biscogniauxia mediterranea , which were isolated from twig cankers in California [ 50 ]. However, the latter species has been very recently reported as the agent of a charcoal disease in Tunisia [ 51 ]. Other recent reports concern Diaporthe ambigua causing twig cankers in Italy [ 52 ] and Neofabraea kienholzii causing leaf and shoot lesions in California [ 53 ], while Cytospora pruinosa recovered from plants showing branch dieback symptoms in Spain was found not to be pathogenic [ 54 ].…”

Section: Occurrence and Ecological Implications Of Endophytic Fungmentioning

confidence: 99%

Endophytic Fungi of Olive Tree

2020

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In addition to the general interest connected with investigations on biodiversity in natural contexts, more recently the scientific community has started considering occurrence of endophytic fungi in crops in the awareness of the fundamental role played by these microorganisms on plant growth and protection. Crops such as olive tree, whose management is more and more frequently based on the paradigm of sustainable agriculture, are particularly interested in the perspective of a possible applicative employment, considering that the multi-year crop cycle implies a likely higher impact of these symbiotic interactions. Aspects concerning occurrence and effects of endophytic fungi associated with olive tree (Olea europaea) are revised in the present paper.

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Section: Occurrence and Ecological Implications Of Endophytic Fungmentioning

confidence: 99%

Endophytic Fungi of Olive Tree

2020

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“…Species of Biscogniauxia , as xylariaceous fungi, are well known for living in plant tissues without development of symptoms (Luchi et al., 2015), as well as causing necrosis on stems and branches, leaf discoloration and dryness in young trees (Henriques et al., 2016). Additionally, the presence of xylariaceous fungi in green leaves of evergreen angiosperm shrubs and trees has been confirmed in other studies, underscoring the unexpected ecological significance of these fungi (Gharbi et al., 2020; Govinda Rajulu et al., 2013; Patejuk et al., 2022; Yangui et al., 2019, 2021). In this context, recent studies have reported Xylariaceae species as causal agents of leaf spot diseases.…”

Section: Resultsmentioning

confidence: 56%

Biscogniauxia rosacearum: A newly identified pathogen of strawberry tree (Arbutus unedo L.) in North Africa

Yangui,

Hlaiem,

khadraoui

et al. 2024

Forest Pathology

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Biscogniauxia species are opportunistic pathogens primarily associated with Quercus species dieback in the Mediterranean basin. Among these species, Biscogniauxia mediterranea stands out as the only species previously documented in Tunisia, affecting Quercus suber and Erica multiflora. This study unveils a novel finding, reporting the presence of Biscogniauxia rosacearum on Strawberry trees in Tunisia. The identification of B. rosacearum isolates was confirmed based on DNA sequence data (ITS, TUB2 and ACT) and morphological traits. Artificial inoculation trials on leaves confirmed the pathogenicity of the fungus towards Arbutus unedo. This finding emphasizes the significance of implementing proactive measures to effectively combat this pathogen because of the polyphagous nature of Biscogniauxia species that raises concerns about its potential spread within vulnerable hosts in Tunisian oak forests.

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“…In a field study conducted in a Portuguese forest in 1974, it was observed that 41.5% of cork oak trees were weakened, and the primary factor contributing to the decline of cork oaks was identified as B. mediterranea [81]. Biscogniauxia species have also been described as pathogens on olive trees in Sfax, Tunisia, which is characterised by a Mediterranean climate [28], but also as an endophyte on olives in Portugal [82]. Another Biscogniauxia species, B. rosaceum, was assessed as having an intermediate level of virulence on olive trees [10].…”

Section: Discussionmentioning

confidence: 99%

“…Biscogniauxia species are recognised for inducing cankers on the bark of trees. B. mediterranea can affect both the trunk and leaves of olive trees, causing the development of longitudinal bark cracks, detached bark and the withering of the crown [28]. In more severe instances, Biscogniauxia infections can lead to stem girdling, where the cankers encircle the tree trunk, as observed in wild almond [39].…”

Section: Sphaeria Discreta Schweinmentioning

confidence: 99%

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Identification and Pathogenicity of Biscogniauxia and Sordaria Species Isolated from Olive Trees

Petrović,

Godena,

Ćosić

et al. 2024

Horticulturae

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A field investigation of olive trees in Istria, Croatia, revealed branch dieback and cracked bark. Samples of diseased branches were collected from eight different locations and analysed. Additionally, meteorological data from two locations were analysed to determine if there was a connection between climatic changes and the appearance of pathogens in the region. Pathogenicity tests were conducted on olive seedlings. This study provides a description of Biscogniauxia and Sordaria species’ morphology and elucidates their phylogeny based on the internal transcribed spacer (ITS), beta-tubulin (TUB2) and translation elongation factor 1-alpha (TEF1- α) regions. This research represents the first documented occurrence of Biscogniauxia mediterranea causing charcoal disease in olive trees in Croatia. Additionally, it is the first report of Biscogniauxia nummularia (Bull.) Kuntze and Sordaria fimicola causing diseases in olive trees anywhere in the world. Furthermore, this study marks one of the initial forays into molecular investigations of these species isolated from olive trees. Considering the potential threat posed by the inherent aggressiveness of Biscogniauxia species, further research is deemed necessary to curb the development of charcoal disease.

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First report of charcoal disease caused by Biscogniauxia mediterranea on Olea europaea in Tunisia

Cited by 4 publications

References 4 publications

Endophytic Fungi of Olive Tree

Endophytic Fungi of Olive Tree

Biscogniauxia rosacearum: A newly identified pathogen of strawberry tree (Arbutus unedo L.) in North Africa

Identification and Pathogenicity of Biscogniauxia and Sordaria Species Isolated from Olive Trees

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