Invaded range of the blackberry pathogen Phragmidium violaceum in the Pacific Northwest of the USA and the search for its provenance

Morin, L.; Gómez, D. R. Sosa; Evans, K. J.; Neill, Tara M.; Mahaffee, Walt; Linde, Celeste C.

doi:10.1007/s10530-013-0413-3

Cited by 8 publications

(3 citation statements)

References 48 publications

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“…More than two populations may be used but they must have a clear phylogeny, as might be the case for three distinct subspecies (42). IMa2 has been used to estimate past migration between two evolutionarily diverging pathogen populations, as well as time since divergence of the populations (50,58,70). Unfortunately, the program runs on only a single processor and is not computationally efficient.…”

Section: Softwarementioning

confidence: 99%

Genome-Enabled Analysis of Plant-Pathogen Migration

Goss

2015

Annu. Rev. Phytopathol.

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Trade in plant and plant products has profoundly affected the global distribution and diversity of plant pathogens. Identification of migration pathways can be used to monitor or manage pathogen movement for proactive disease management or quarantine measures. Genomics-based genetic marker discovery is allowing unprecedented collection of population genetic data for plant pathogens. These data can be used for detailed analysis of the ancestry of population samples and therefore for analysis of migration. Reconstruction of migration histories has confirmed previous hypotheses based on observational data and led to unexpected new findings on the origins of pathogens and source populations for past and recent migration. The choice of software for analysis depends on the type of migration being studied and the reproductive mode of the pathogen. Biased sampling and complex population structures are potential challenges to accurate inference of migration pathways.

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Section: Softwarementioning

confidence: 99%

Genome-Enabled Analysis of Plant-Pathogen Migration

Goss

2015

Annu. Rev. Phytopathol.

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“…Adding to this perplexity in naming R. armeniacus in the Pacific Northwest has been the recent documentation of another morphologically similar nonnative Rubus species. The detection and subsequent identification of this new taxon was tied to the discovery of the exotic rust Phragmidium violaceum (Schultz) G. Winter, first detected in southern Oregon in 2005 and studied as a potential biological control agent against invasive blackberries (Osterbauer et al 2005; Callan et al 2011; Peters 2012; Morin et al 2013). Clark et al (2013) investigated the origins of exotic Rubus in the western U.S. and concluded that in addition to the widespread R. armeniacus , there was an unaccounted member of the Rubus fruticosus L. aggregate, and tentatively named this Rubus anglocandicans A. Newton.…”

Section: Introductionmentioning

confidence: 99%

Community Scientists Survey and Assess Invasive Rubus Spp. in Portland Natural Areas: Management Strategies Against Rubus armeniacus Should Not be Altered Due to the Presence of the Congener Rubus praecox

2024

Natural Areas Journal

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Dense thickets of invasive, exotic blackberries (Rubus spp.) are common in many disturbed sites throughout the western Pacific Northwest. Most of these blackberry brambles are widely accepted as Rubus armeniacus. Published accounts from the past decade however, have revealed a morphologically similar species, Rubus praecox, to be broadly distributed and it can occur in many of the same habitats as R. armeniacus. In this study, local community scientists were engaged to assess the distribution and relative abundances of these two Rubus species in 13 smallto mid-sized parks managed by the City of Portland. At all surveyed parks, R. armeniacus occurred in various quantities. Rubus praecox was only present in negligible amounts at four sites. A review of online herbarium specimens similarly supports this finding of broadly distributed but low quantities of R. praecox. Based on these results, we conclude that current management practices to control invasive Rubus spp. should not be altered due to the slight chance of encountering a less common exotic Rubus species. We also strongly support the engagement and training of local community members to actively learn about their native and exotic flora to support the conservation of local natural areas.

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“…Phragmidium violaceum (Schulz) Winter is a leaf-rust fungus indigenous to Europe and Asia (Tykhonenko 2007) that currently has a global distribution (Morin et al 2013). This rust is an obligate biotrophic pathogen, characterized by high aggressiveness and strong specificity (Bruzzese and Hasan 1986;Morin et al 2006Morin et al , 2011Morin et al , 2013. Consequently, it has been used as a biological control for some species of the Rubus genus in Australia, New Zealand and Chile (Oehrens and González 1974;Morin et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of rust pathogenicity (Phragmidium violaceum) as a biological control agent for the invasive plant Rubus ulmifolius on Robinson Crusoe Island, Chile

Vargas-Gaete

Doussoulin

Smith‐Ramírez

et al. 2019

Australasian Plant Pathol.

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Rubus ulmifolius is a highly invasive species that negatively affects biodiversity, especially on Robinson Crusoe Island (RCI), one of the two global mini-hotspots of vascular plants. The rust Phragmidium violaceum has been used as a biological control agent for some Rubus species in mainland Chile, New Zealand and Australia. We aim to quantify P. violaceum pathogenicity over R. ulmifolius on RCI, under both field and laboratory conditions, to determine its potential as a biological control. In addition, in order to broaden our knowledge about the pathogenicity of P. violaceum from RCI, it was also tested on a highly susceptible Rubus species: R. cf. constrictus. We sampled four forest sites on RCI, measuring abiotic, micro-site, and vegetation variables that could be related with infection. In the laboratory, we inoculated P. violaceum into R. ulmifolius seedlings from RCI and R. cf. constrictus seedlings from mainland Chile. We found a low infection incidence in the field, where only 62 of 182 plots presented infected individuals. Applying a fitted generalized linear model, we predicted ten times more infection of P. violaceum on R. ulmifolius when located in southern aspect slopes and shallow soils (< 30 cm). In the laboratory we determined that rust from RCI infected R. ulmifolius individuals from the island in low density, and did not infect R. cf. constrictus; this low infection rate reinforces our field results. The low infection on R. cf. constrictus may mean that P. violaceum from RCI could originate from very impoverished genetic material. We recommend testing different rust genetic origins, mainly from the Old World, to increase their genetic diversity.

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Invaded range of the blackberry pathogen Phragmidium violaceum in the Pacific Northwest of the USA and the search for its provenance

Cited by 8 publications

References 48 publications

Genome-Enabled Analysis of Plant-Pathogen Migration

Genome-Enabled Analysis of Plant-Pathogen Migration

Community Scientists Survey and Assess Invasive Rubus Spp. in Portland Natural Areas: Management Strategies Against Rubus armeniacus Should Not be Altered Due to the Presence of the Congener Rubus praecox

Evaluation of rust pathogenicity (Phragmidium violaceum) as a biological control agent for the invasive plant Rubus ulmifolius on Robinson Crusoe Island, Chile

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