<i>Phomopsis cotoneastri</i> as a Pathogen Associated with Trunk Cankers and Death of Young Apple Trees cv. Cripps Pink

Abreo, Eduardo; Martínez, Sebastián; Sessa, Lucía; Bettucci, Lina; Lupo, Sandra

doi:10.1111/j.1439-0434.2012.01914.x

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…Interestingly, Diaporthe amygdali , the well known and highly frequent pathogen associated with constriction canker in peach shoots, and Diaporthe eres , previously associated with cankers in young apple trees (Abreo, Martínez, Sessa, Bettucci, & Lupo, ), were not recovered as latent pathogens from any of the hosts. Possible explanations for these notorious absences could be that these pathogenic species have a very short latent stage, and therefore, they would be less likely to be present in the sampled asymptomatic twigs, or that they are actually outcompeted by true endophytes in young intact branches.…”

Section: Discussionmentioning

confidence: 95%

Diversity of fungal latent pathogens and true endophytes associated with fruit trees in Uruguay

Sessa

Abreo

Lupo

2018

Journal of Phytopathology

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We have explored the fungal diversity in asymptomatic twigs of apple, peach, pear and blueberry trees, with the objective of discerning between true endophytes and latent pathogens. Several fungal genera containing known bark pathogens were found. Seven Diaporthe species—D. oxe, D. infecunda, D. serafiniae, D. phaseolorum, D. terebinthifolii, D. foeniculina and D. brasiliensis—were identified, along with Botryosphaeria dothidea, Neofusicoccum parvum, Neofusicoccum australe, Cytospora sp., Cytospora acaciae and Pestalotiopsis spp. A pathogenicity trial was undertaken to determine the role of these species on apple, pear, blueberry and peach shoots. Diaporthe brasiliensis, D. foeniculina, Diaporthe inconspicua, D. terebinthifolii, Diaporthe sp.1, Cytospora‐like isolates and Pestalotiopsis spp. isolates produced no lesions on inoculated shoots, suggesting that they could be considered true endophytes on their respective hosts. Meanwhile, some of the isolates of Diaporthe—D. oxe, Diaporthe sp.2, D. infecunda and D. serafiniae, B. dothidea, N. parvum and N. australe could be regarded as latent pathogens in their respective hosts as they produced sunken cankers and necrosis on inoculated shoots. These results demonstrate that apple, pear, blueberry and peach healthy shoots can host many known endophytic fungi along with potential wood disease‐causing fungi that should be regarded as latent pathogens.

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Section: Discussionmentioning

confidence: 95%

Diversity of fungal latent pathogens and true endophytes associated with fruit trees in Uruguay

Sessa

Abreo

Lupo

2018

Journal of Phytopathology

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“…In fact, Diaporthe spp. have been reported infecting many plants resulting in severe diseases, e.g., seed decay of soybean ( Sun et al 2013 ), canker and twig dieback of jujube ( Zhang et al 2018 ), cordon dieback of kiwifruits ( Díaz & Latorre 2018 ), and shoot canker diseases of citrus or grapevines ( Van Niekerk et al 2005 , Huang et al 2013 ), and of Rosaceae plants, e.g., peach ( Dissanayake et al 2017 ), apple ( Abreo et al 2012 ), blackberry ( Vrandecic et al 2011 ), and almond ( Diogo et al 2010 ).…”

Section: Discussionmentioning

confidence: 99%

High diversity of Diaporthe species associated with pear shoot canker in China

Guo¹,

Crous²,

Bai³

et al. 2020

persoonia

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Species of Diaporthe (syn. Phomopsis) are important endophytes, saprobes and pathogens, infecting a wide range of plants and resulting in important crop diseases. However, the species occurring on pear remain largely unresolved. In this study, a total of 453 Diaporthe isolates were obtained from branches of Pyrus plants (including P. bretschneideri, P. communis, P. pyrifolia and P. ussuriensis collected from 12 provinces in China) showing shoot canker symptoms. Phylogenetic analyses based on five loci (ITS, TEF, CAL, HIS, and TUB) coupled with morphology of 113 representative isolates revealed that 19 Diaporthe species were isolated, representing 13 known species (including D. caryae, D. cercidis, D. citrichinensis, D. eres, D. fusicola, D. ganjae, D. hongkongensis, D. padina, D. pescicola, D. sojae, D. taoicola, D. unshiuensis and D. velutina) and six new species described here as D. acuta, D. chongqingensis, D. fulvicolor, D. parvae, D. spinosa and D. zaobaisu. Although Koch’s postulates confirmed all species to be pathogenic, a high degree of variation in aggressiveness was observed. Moreover, these species have a high diversity, plasticity, and prevalence related to the geographical location and pear species involved.

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“…Diaporthe cotoneastri is associated with the trunk canker of apple trees (Malus domestica Borkh.) [71] and Ilyonectria robusta with root diseases of kiwifruit (Actinidia chinensis Planch. ), avocado (Persea Americana Mill.…”

Section: Discussionmentioning

confidence: 99%

Role of Root and Stem Base Fungi in Fraxinus angustifolia (Vahl) Dieback in Croatian Floodplain Forests

Orlović

Moro

Diminić

2020

Forests

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Large-scale ash (Fraxinus spp.) dieback caused by the fungus Hymenoscyphus fraxineus has been a major concern throughout Europe for more than two decades. Most of the related research has been focused on Fraxinus excelsior L., and there is still little information on fungal involvement in the dieback of Fraxinus angustifolia Vahl, especially in roots and stem bases, which play an important role in decline progress and tree stability. The objectives of this study were to identify fungi present in visually healthy and symptomatic wood tissues in basal parts of narrow-leaved ash trees in different decline phases, in order to determine the possible role of these fungi and their importance in the dieback process. The stem bases and roots of 90 trees in three different health categories, determined based on crown defoliation, were sampled in natural stands affected by ash dieback. Isolated fungal cultures were identified based on the rDNA ITS (Internal transcribed spacer) region and their association with tree health status was analyzed. In total, 68 different fungal taxa were confirmed, including Hymenoscyphus fraxineus and Armillaria spp., which were mainly present in roots, although overall in lower frequencies than on common ash in other studies. Most frequently isolated fungal taxa, which encompassed 51% of all obtained isolates, were Trichoderma spp., Ilyonectria robusta, Fusarium solani, Cladosporium cladosporioides, and Diaporthe cotoneastri. Their associations with tree health categories and presence in both symptomatic and visually healthy wood indicate that they act as opportunistic pathogens and early colonizers of weakened ash tissues. Research also revealed that, although the extent of crown defoliation and presence of root and stem necroses were associated, basal symptoms occurred on a number of trees with healthy looking crowns, meaning they can develop independently.

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Phomopsis cotoneastri as a Pathogen Associated with Trunk Cankers and Death of Young Apple Trees cv. Cripps Pink

Cited by 8 publications

References 7 publications

Diversity of fungal latent pathogens and true endophytes associated with fruit trees in Uruguay

Diversity of fungal latent pathogens and true endophytes associated with fruit trees in Uruguay

High diversity of Diaporthe species associated with pear shoot canker in China

Role of Root and Stem Base Fungi in Fraxinus angustifolia (Vahl) Dieback in Croatian Floodplain Forests

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