Species associated with cytospora canker on &lt;I&gt;Populus tremuloides&lt;/I&gt;

Kepley, J. B.; Reeves, F. Brent; Jacobi, William R.; Adams, Gerard C.

doi:10.5248/130.783

Cited by 23 publications

(14 citation statements)

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“…In the past decade, we have participated in four new and sudden forest disease studies in which we have struggled to identify causal agents: 1) the present study on the aspen running canker of P. tremuloides in Alaska; 2) Tsuga heterophylla branch dieback and mortality in Alaska (unpublished data); 3) Alder canker and mortality in Alaska and the high altitude southern Rocky Mountains (Stanosz et al 2010;Worrall et al 2010a); and 4) sudden aspen death on P. tremuloides in the southern Rocky Mountains in the USA. (Kepley et al 2015). The first three diseases presented as undiagnosed canker diseases occurring on three different hosts.…”

Section: Discussionmentioning

confidence: 99%

Determining the novel pathogen Neodothiora populina as the causal agent of the aspen running canker disease in Alaska

Winton

Adams

Ruess

2021

Canadian Journal of Plant Pathology

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Neodothiora populina Crous, G.C. Adams & Winton was determined to be a new pathogen of trembling aspen (Populus tremuloides) growing in Alaska, based on completion of Koch's Postulates in replicated forest and growth chamber inoculation trials. The pathogen is responsible for severe damage and widespread rapid mortality of sapling to mature aspen (≥ 80 years) in the boreal forests of interior Alaska, due to large diffuse annual (1-2 years) cankers. Isolation of the pathogen was challenging, and identification based on cultural characters was difficult. Fruiting bodies were not found on wild diseased trees, but erumpent pycnidia were found in bark overlying cankers on several stems inoculated with pure cultures.

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Section: Discussionmentioning

confidence: 99%

Determining the novel pathogen Neodothiora populina as the causal agent of the aspen running canker disease in Alaska

Winton

Adams

Ruess

2021

Canadian Journal of Plant Pathology

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“…Cytospora phitsanulokensis differs from C. italica by its larger conidiomata, shorter conidiogenous cell and longer conidia [51] (Table 4). Complete descriptions of C. acaciae and C. magnoliae were not available for morphological comparison [11,52]. Adam et al [11] reported that Cytospora acaciae produces phialides with a long narrow channel of apical pores with lipid globules at one end of conidium; however, these characteristics were not observed in C. phitsanulokensis.…”

Section: 22mentioning

confidence: 99%

Discovery of Three Novel Cytospora Species in Thailand and Their Antagonistic Potential

et al. 2021

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During an ongoing research survey of saprobic fungi in Thailand, four coelomycetous strains were isolated from decaying leaves in Chiang Mai and Phitsanulok Provinces. Morphological characteristics demonstrated that these taxa are typical of Cytospora in forming multi-loculate, entostromatic conidiomata, branched or unbranched conidiophores, with enteroblastic, phialidic conidiogenous cells and hyaline, allantoid, aseptate conidia. Multiloci phylogeny of ITS, LSU, ACT, RPB2, TEF1-α and TUB2 confirmed these taxa are distinct new species in Cytospora in Cytosporaceae (Diaporthales, Sordariomycetes), viz., Cytospora chiangmaiensis, C. phitsanulokensis and C. shoreae. Cytospora chiangmaiensis has a close phylogenetic relationship with C. shoreae, while C. phitsanulokensis is sister to C. acaciae. These three novel species were also preliminary screened for their antagonistic activity against five plant pathogenic fungi: Colletotrichum fructicola, Co. siamense, Co. artocarpicola, Co. viniferum and Fusarium sambucinum. Cytospora shoreae and C. phitsanulokensis showed >60% inhibition against Co. viniferum and F. sambucinum, while C. chiangmaiensis had moderate inhibition activity against all pathogens.

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“…Thus detailed investigation is required to test if cryptic divergence or misidentification is involved in this species. Other hosts of C. leuscostoma include plants of Alnus, Betula, Chaenomeles, Cornus, Elaeagnus, Persica, Rosa, Sorbus and Vitis (Adams et al 2002;Fotouhifar et al 2010;Kepley et al 2015;Zhu et al 2018;.…”

Section: Genbank Authoritymentioning

confidence: 99%

Fungal species associated with apple Valsa canker in East Asia

2020

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Since its discovery more than 110 years ago, Valsa canker has emerged as a devastating disease of apple in East Asia. However, our understanding of this disease, particularly the identity of the causative agents, has been in a state of confusion. Here we provide a synopsis for the current understanding of Valsa canker and the taxonomy of its causal agents. We highlight the major changes concerning the identity of pathogens and the conflicting viewpoints in moving to “One Fungus = One Name” system for this group of fungal species. We compiled a list of 21 Cytospora species associated with Malus hosts worldwide and curated 12 of them with rDNA-ITS sequences. The inadequacy of rDNA-ITS in discriminating Cytospora species suggests that additional molecular markers, more intraspecific samples and robust methods are required to achieve reliable species recognition.

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Species associated with cytospora canker on <I>Populus tremuloides</I>

Cited by 23 publications

References 0 publications

Determining the novel pathogen Neodothiora populina as the causal agent of the aspen running canker disease in Alaska

Determining the novel pathogen Neodothiora populina as the causal agent of the aspen running canker disease in Alaska

Discovery of Three Novel Cytospora Species in Thailand and Their Antagonistic Potential

Fungal species associated with apple Valsa canker in East Asia

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