Urban London plane tree dieback linked to fungi in the Botryosphaeriaceae

Pelleteret, Pegah; Crovadore, Julien; Cochard, Bastien; Pasche, Sabrina; Bovigny, Pierre-Yves; Chablais, Romain; Lefort, François

doi:10.1016/j.ufug.2017.01.014

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…Although some of the symptoms evaluated in this study resemble those previously described as being caused by Ceratocystis platani or by Splanchnonema platani (6-9) (21)(22)(23) , none of these pathogens were previously reported in our region neither isolated from the samples processed in this work. Similarly, Pelleret and others (24) , studying plane trees with symptoms like those caused by C. platani (cankers and dieback, trunk, and branch necrosis), mainly isolated Neofusicoccum parvum and Diplodia pseudoseriata among others Botryosphaeriaceae, and isolated Ceratocystis platani only from 2 trees (out of 6 symptomatic trees).…”

Section: Discussionmentioning

confidence: 80%

“…Species belonging to this family are also reported as endophytes (35)(36) . Pelleret and others (24) hypothesize that these Botryosphaeriaceae species could be responsible for the observed cankers on plane trees, while other fungal species could contribute to the dieback symptoms. Similarly to Pelleret and others (24) , during this study Diplodia mutila and Neofusicoccum parvum were isolated from symptomatic tissue of Platanus x acerifolia.…”

Section: Discussionmentioning

confidence: 97%

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Fungi associated to Platanus x acerifolia in Uruguay and failure indicators

et al. 2023

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In the last few years, the interest in keeping the city trees healthy has increased in order to improve their survival and minimize claims due to potential accidents. The pest and diseases, the pollution, and the climate change together with the little genetic diversity of trees in urban areas are some of the factors that contribute to increase the likelihood of death and/or failure of trees in the cities. This work is part of a sanitary and risk of failure assessment of plane street trees (Platanus x acerifolia) carried out between 2019 and 2020. A random sample of 10 city blocks and their 193 plane trees was selected. In these, the presence of cankers, abnormal bark colorations, deformations, and a series of structural attributes that determine likelihood of failure variables were registered. The proportion of individuals with each symptom and the severity main index (SMI) were calculated as a weighted average of the different severity (SEV) levels in the total of evaluated plants. The severity indices were determined according to trunk or branches circumference and the portion of the tree affected (1st, 2nd or 3rd portion from the base). Deformations presented the main incidence (0.6), SMI (1.68) and a correlation with the presence of damages and human injuries. The presence of cankers and reddish bark were the symptoms that most affected the density of the crowns.

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Section: Discussionmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 97%

Fungi associated to Platanus x acerifolia in Uruguay and failure indicators

et al. 2023

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“…This observation of Neofusicoccum parvum being a woody plant pathogen is congruent with the report of similar symptoms observed on Platanus × acerifolia trees in Geneva. These symptoms were attributed to this fungal species after demonstrating that this fungal species was causing cankers in London plane trees [26].…”

Section: Discussionmentioning

confidence: 99%

“…Another sequoia tree located in Lullier, S. giganteum "Pendulum," showed Neofusicoccum parvum on diseased twigs presenting canker symptoms, another Botryosphaeriaceae species, Diplodia mutila, anamorph of Botryosphaeria stevensii, on its bark. This last species is known to colonise barks of ash trees [24], grapevine [25], and London plane trees [26]. It is noticeable that Neofusicoccum parvum has been isolated from the seven studied sites.…”

Section: Isolation and Genetic Identificationmentioning

confidence: 99%

Neofusicoccum parvum, A New Agent of Sequoia Canker and Dieback Identified in Geneva, Switzerland

Haenzi

Cochard

Chablais

et al. 2021

Forests

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Fungi were isolated in pure cultures from decaying giant sequoias in Geneva (Switzerland). Isolates were genetically identified by ITS rDNA sequencing. Young giant sequoia trees were artificially infected with a pure culture of Botryosphaeria parva. Henle-Koch’s Postulates demonstrated that Botryosphaeria parva was pathogenic to Sequoiadendron giganteum. When analysing the microorganisms associated to canker and dieback symptoms in a giant sequoias (Sequoiadendron giganteum) in Geneva, the fungus Neofusicoccum parvum (Pennycook & Samuels) Crous, Slippers & A.J.L. Phillips, teleomorph Botryosphaeria parva (Pennycook & Samuels) Crous, Slippers & A.J.L. Phillips, was isolated, whereas such symptoms are commonly associated to Fusicoccum aesculi (teleomorph Botryosphaeria dothidea). These two fungal species belong to the same genus Botryosphaeria of the Botryosphaeriaceae family. Because Neofusicoccum parvum was causing cankers and diebacks in other woody species around the world, we extended the analysis to other trees displaying sequoia dieback symptoms in order to evaluate the involvement of Neofusicoccum parvum in such increasing symptoms in sequoias in Geneva. Dried twigs, trunk, and branch cankers from diseased trees were sampled on several distinct sites. From all samples, isolated fungi in pure cultures showed a phenotype typical of Botryosphaeriaceae species. Isolates were then genetically identified at the species level. Subsequently Neofusicoccum parvum was inoculated to young giant sequoia trees, re-isolated in pure culture from provoked symptoms, and re-identified to fulfil Henle-Koch’s postulates. The identification confirmed that Neofusicoccum parvum was present on all sites, while Fusicoccum aesculi was retrieved only once alone. The inoculation of Neofusicoccum parvum isolates on young sequoias demonstrated for the first time that this fungus was able to develop cankers in Sequoiadendron gigantean. Neofusicoccum parvum could, therefore, be the major cause for dying of giant sequoias in the Geneva Lake area.

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“…У сучасних літературних джерелах також представлені дослідження з біології та екології окремих видів Dothideomycetes (Lee, 2016;Ji et al, 2017), асоційованих із різними видами рослин-господарів в антропогенних умовах (Rodríguez-Gálvez et al, 2017;Vivas et al, 2017), у тому числі інтродуцентами (Raghavendra et al, 2017). Серед них найповніше розглянуті представники порядку Botryosphaeriales,збудники раку та відмирання деревини сільськогосподарських (Mehl et al, 2017), лісотвірних (Sakalidis et al, 2011;Lawrence et al, 2017) і декоративних рослин (Pavlic-Zupanc et al, 2017;Pelleteret et al, 2017).…”

Section: вступunclassified

Species composition of Dothideomycetes in the anthropogenically transformed ecosystems of the steppe zone of Ukraine

Korolyova

2017

Biosys. divers.

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The article considers the species composition of the Dothideomycetes and its structural characteristics in conditions of anthropogenically transformed ecosystems of the steppe zone of Ukraine. The materials of the work were the original mycological collection carried out as part of the mycological survey of this territory during 2008–2016, as well as the materials of the herbarium of the Institute of Botany named after M. Kholodny of the National Academy of Sciences of Ukraine. Herbarium collection and identification of the samples were performed in accordance with the generally accepted methods of cameral processing of xylotrophic, herbotrophic and coprothrophic micromycetes. To establish the taxonomic affiliation of species, the method of light microscopy was applied. As a result of our research, the species diversity of ascolocular fungi (Dothideomycetes) has been established in the anthropogenically transformed ecosystems of the steppe zone of Ukraine, which includes 156 species from 43 genera 19 families 5 orders and groups of taxa of Incertae sedis of the subclasses Dothideomycetidae and Pleosporomycetidae. The characteristic features of the taxonomic structure of the investigated mycobiota are the predominance of representatives of the order of Pleosporales, the families Cucurbitariaceae and Mycosphaerellaceae, the genera Cucurbitaria and Mycosphaerella. In the ecological structure of mycobiota in anthropogenically transformed ecosystems saprotrophic and xylotrophic species dominated. The ascolocular fungi species are form consortium connections with 178 species of vascular plants from 112 genera of 51 families, with the largest number of micromycetes (65 species) noted on plants of the Rosaceae. An analysis of the abundance of species in anthropogenically transformed ecosystems of the investigated area showed that 47% of the species are randomly distributed. Widespread species are Dothidea sorbi (Wahlenb.) Sacc., Cucurbitaria caraganae P. Karst., C. amorphae (Wallr.) Fuckel, Botryosphaeria dothidea (Moug.) Ces. & De Not., Otthia spiraeae (Fuckel) Fuckel. In the anthropogenically transformed ecosystems of the steppe zone of Ukraine, in comparison with natural ecosystems, the proportion of species from the genera Cucurbitaria and Mycosphaerella increases quantitatively, and the proportion of Leptosphaeria and Pleospora species decreases. An increase in the proportion of hemibiotrophic species in the ecological structure can be considered a characteristic feature of anthropogenic influence on mycobiota . Comparative analysis of quantitative and qualitative indicators of the mycobiota structure combined with spatial and temporal changes of these indicators can serve as an instrument for indicating its anthropogenic transformation. It would be promising to conduct further research on changes in the species structure of micromycetes exposed to various types of anthropogenic impact in terrestrial ecosystems of the steppe zone of Ukraine.

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Urban London plane tree dieback linked to fungi in the Botryosphaeriaceae

Cited by 10 publications

References 27 publications

Fungi associated to Platanus x acerifolia in Uruguay and failure indicators

Fungi associated to Platanus x acerifolia in Uruguay and failure indicators

Neofusicoccum parvum, A New Agent of Sequoia Canker and Dieback Identified in Geneva, Switzerland

Species composition of Dothideomycetes in the anthropogenically transformed ecosystems of the steppe zone of Ukraine

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