Dactylonectria torresensis as the Main Component of the Black Root Rot Complex of Strawberries and Raspberries in Northern Germany

Weber, Roland W.S.; Entrop, Alfred-Peter

doi:10.1007/s10341-017-0343-9

Cited by 18 publications

(9 citation statements)

References 32 publications

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“…The size and septation of macroconidia and microconidia of D. torresensis isolated from Andean blackberry agree within the description by Cabral et al [10] and the shape of its conidiophores (elongated, with a slight widening and minute curves) is in accordance with the observations by Weber and Entrop when they determined the association of this fungus with black root rot of strawberry and blackberry [6]. The morphology of the I. robusta and I. venezuelensis isolates described in our study is congruent with the definitions by Cabral et al for each of those species [8].…”

Section: Discussionsupporting

confidence: 90%

Dactylonectria and Ilyonectria Species Causing Black Foot Disease of Andean Blackberry (Rubus Glaucus Benth) in Ecuador

et al. 2019

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Andean blackberry (Rubus glaucus Benth) plants from the provinces of Tungurahua and Bolivar (Ecuador) started showing symptoms of black foot disease since 2010. Wilted plants were sampled in both provinces from 2014 to 2017, and fungal isolates were obtained from tissues surrounding necrotic lesions in the cortex of the roots and crown. Based on morphological characteristics and DNA sequencing of histone 3 and the translation elongation factor 1α gene, isolates were identified as one of seven species, Ilyonectria vredehoekensis, Ilyonectria robusta, Ilyonectria venezuelensis, Ilyonectria europaea, Dactylonectria torresensis, or Dactylonectria novozelandica. Pathogenicity tests with isolates from each species, excluding I. europaea and D. novozelandica whose isolates were lost due to contamination, confirmed that the four species tested can produce black foot disease symptoms in Andean blackberry. This is the first report of Dactylonectria and Ilyonectria species causing black foot disease of Andean blackberry.

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Section: Discussionsupporting

confidence: 90%

Dactylonectria and Ilyonectria Species Causing Black Foot Disease of Andean Blackberry (Rubus Glaucus Benth) in Ecuador

et al. 2019

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“…These findings support the hypothesis of a causal relation of these fungi to the induction of replant disease, at least in our tested soils. Moreover, based on long-term and in-depth research on Rosaceous small fruits in Northern Germany Weber and Entrop 17 also suggested clarifying the significance of Nectriaceae in replant disease. This fungal group includes the Cylindrocarpon -like fungi, which were described as associated microorganisms in replant diseased apple and peach 13 , 32 , 35 , 58 .…”

Section: Discussionmentioning

confidence: 99%

Observations on early fungal infections with relevance for replant disease in fine roots of the rose rootstock Rosa corymbifera 'Laxa'

Grunewaldt-Stöcker

Popp

Baumann

et al. 2020

Sci Rep

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Replant disease is a worldwide phenomenon affecting various woody plant genera and species, especially within the Rosaceae. Compared to decades of intensive studies regarding replant disease of apple (ARD), the replant disease of roses (RRD) has hardly been investigated. The etiology of RRD is also still unclear and a remedy desperately needed. In greenhouse pot trials with seedlings of the RRD-sensitive rootstock Rosa corymbifera ‘Laxa’ cultured in replant disease affected soils from two different locations, early RRD symptom development was studied in fine roots. In microscopic analyses we found similarities to ARD symptoms with regards to structural damages, impairment in the root hair status, and necroses and blackening in the cortex tissue. Examinations of both whole mounts and thin sections of fine root segments revealed frequent conspicuous fungal infections in association with the cellular disorders. Particularly striking were fungal intracellular structures with pathogenic characteristics that are described for the first time. Isolated fungi from these tissue areas were identified by means of ITS primers, and many of them were members of the Nectriaceae. In a next step, 35 of these isolates were subjected to a multi-locus sequence analysis and the results revealed that several genera and species were involved in the development of RRD within a single rose plant. Inoculations with selected single isolates (Rugonectria rugulosa and Ilyonectria robusta) in a Perlite assay confirmed their pathogenic relationship to early necrotic host plant reactions, and symptoms were similar to those exhibited in ARD.

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“…peuce , respectively), in which the sample, Glauc13, was one of the successful antagonists of H. parviporum . This fungus has been reported as the cause of root rot and decline in host health in strawberry, raspberry, olive trees, and in apple orchards [69,70,71]. Although species from the genus, Dactylonectria , have been encountered in European old-growth forests [72], no study has reported the presence of this genus in Picea or Pinus before.…”

Section: Discussionmentioning

confidence: 99%

New R-Based Methodology to Optimize the Identification of Root Endophytes against Heterobasidion parviporum

2019

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Many root fungal endophytes inhabiting forest trees have potential impact on the health and disease progression of certain tree species. Hence, the screening of root endophytes for their biocontrol abilities is relevant for their potential to protect their hosts against invaders. The aim of this research is to screen for the potential inhibitory effects of selected conifer root endophytes during interaction, in vitro, with the root rot pathogen, Heterobasidion parviporum. Here, we introduce a guideline that facilitates the use of root fungal endophytes as biocontrol agents. We isolated fungal root endophytes from eight different conifers. These root fungal endophytes were evaluated for their antagonism against the root rot pathogen, H. parviporum, by means of paired-culture antagonism assays. We determined the antagonism of the isolated root fungal endophytes to elucidate potential biocontrol applications. For the analysis, a software package in R was developed. Endophyte candidates with antagonistic potential were identified.

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Dactylonectria torresensis as the Main Component of the Black Root Rot Complex of Strawberries and Raspberries in Northern Germany

Cited by 18 publications

References 32 publications

Dactylonectria and Ilyonectria Species Causing Black Foot Disease of Andean Blackberry (Rubus Glaucus Benth) in Ecuador

Dactylonectria and Ilyonectria Species Causing Black Foot Disease of Andean Blackberry (Rubus Glaucus Benth) in Ecuador

Observations on early fungal infections with relevance for replant disease in fine roots of the rose rootstock Rosa corymbifera 'Laxa'

New R-Based Methodology to Optimize the Identification of Root Endophytes against Heterobasidion parviporum

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