Root Rot of Chamaecyparis Caused by a Species of Phytophthora

Tucker, C. M.; Milbrath, J. A.

doi:10.1080/00275514.1942.12020875

Cited by 25 publications

(25 citation statements)

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“…All the Phytophthora-like isolates were stored on V8 agar in sterile water (at UMR BIOGECO, INRA). All these isolates were characterized by a slow growth rate at 20°C and morphological characteristics similar to those described for P. lateralis (Tucker and Milbrath 1942). However, deciduous sporangia with short pedicels were observed (Fig.…”

Section: Isolation and Identificationsupporting

confidence: 57%

Root and aerial infections of Chamaecyparis lawsoniana by Phytophthora lateralis: a new threat for European countries

et al. 2010

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Phytophthora lateralis has been isolated from root and collar lesions in Port-Orford Cedar (POC) trees (Chamaecyparis lawsoniana) in northwestern France (Brittany). These trees, planted in hedgerows, displayed symptoms similar to the typical symptoms of POC root disease. Until now, the disease has been found outside of the nurseries only in western North America. Aerial symptoms, not associated with root or collar infections, were also observed, and P. lateralis was isolated from branch lesions. Similar symptoms were previously observed only in one POC root disease site, located in the Pacific coast of Oregon where climatic conditions are similar to those occurring in Brittany. The reported aetiology as well as the morphological characteristics (deciduous sporangia) of P. lateralis suggests that this species could be air-dispersed, as described for P. ramorum, a closely related species. This outbreak of P. lateralis in Brittany in farming landscapes associated with the aerial spread of this pathogen represents a new threat for European countries.

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Section: Isolation and Identificationsupporting

confidence: 57%

Root and aerial infections of Chamaecyparis lawsoniana by Phytophthora lateralis: a new threat for European countries

et al. 2010

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“…3). This is to be expected given that P. lateralis is assumed to be homothallic (Tucker & Milbrath, 1942;Kroon et al, 2012;Martin et al, 2012) and therefore highly inbred. On the other hand, P. ramorum is heterothallic (Kroon et al, 2012;Martin et al, 2012) but does not appear to reproduce sexually in Europe and North America (Goss et al, 2009) and so has no mechanism for eliminating heterozygosity through sexual recombination (Charlesworth & Wright, 2001).…”

Section: Comparison Of P Lateralis Genome Vs Previously Sequenced Pmentioning

confidence: 94%

“…Phytophthora lateralis (Tucker & Milbrath, 1942) is a pathogen of trees in the family Cupressaceae (Robin et al, 2011), including the Lawson cypress or Port Orford cedar (Chamaecyparis lawsoniana). It is closely related to P. ramorum, with which it occurs in the 8c clade together with P. hibernalis, a pathogen of citrus (Blair et al, 2008;Kroon et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Genome-wide sequencing ofPhytophthora lateralisreveals genetic variation among isolates from Lawson cypress (Chamaecyparis lawsoniana) in Northern Ireland

Quinn

O’Neill

Harrison

et al. 2013

FEMS Microbiol Lett

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Phytophthora lateralis is a fungus-like (oomycete) pathogen of trees in the family Cupressaceae, including Chamaecyparis lawsoniana (Lawson cypress or Port Orford cedar). Known in North America since the 1920s, presumably having been accidentally introduced from its assumed East Asian centre of origin, until recently, this pathogen has not been identified causing disease in Europe except for a few isolated outbreaks. However, since 2010, there have been several reports of infection of C. lawsoniana by P. lateralis in the United Kingdom, including Northern Ireland. We sequenced the genomes of four isolates of P. lateralis from two sites in Northern Ireland in 2011. Comparison with the closely related tree and shrub pathogen P. ramorum (cause of ramorum disease of larch and other species in the UK) shows that P. lateralis shares 91.47% nucleotide sequence identity over the core conserved compartments of the genome. The genomes of the four Northern Ireland isolates are almost identical, but we identified several single-nucleotide polymorphisms (SNPs) that distinguish between isolates, thereby presenting potential molecular markers of use for tracking routes of spread and in epidemiological studies. Our data reveal very low rates of heterozygosity (compared with P. ramorum), consistent with inbreeding within this P. lateralis population.

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“…C. obtusa and related species are also in the nursery trade, brought back from Asia by early plant explorers. The pathogen was first noted killing cedars in horticultural nurseries and landscape plantings in Washington state around 1920 and spread quickly through the west coast nursery industry and into landscape plantings of POC [40]. The disease (Port-Orford cedar root disease) nearly eliminated C. lawsoniana from the nursery trade and continues to spread in old established ornamental and windbreak plantings throughout western North America.…”

Section: Phytophthora Lateralismentioning

confidence: 98%

Phytophthora Species Emerging as Pathogens of Forest Trees

Hansen

2015

Curr Forestry Rep

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Root Rot of Chamaecyparis Caused by a Species of Phytophthora

Cited by 25 publications

References 0 publications

Root and aerial infections of Chamaecyparis lawsoniana by Phytophthora lateralis: a new threat for European countries

Root and aerial infections of Chamaecyparis lawsoniana by Phytophthora lateralis: a new threat for European countries

Genome-wide sequencing ofPhytophthora lateralisreveals genetic variation among isolates from Lawson cypress (Chamaecyparis lawsoniana) in Northern Ireland

Phytophthora Species Emerging as Pathogens of Forest Trees

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