Stream Monitoring for Detection of <i>Phytophthora ramorum</i> in Oregon Tanoak Forests

Sutton, Wendy; Hansen, E. M.; Reeser, Paul; Kanaskie, Alan

doi:10.1094/pdis-93-11-1182

Cited by 54 publications

(43 citation statements)

References 17 publications

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“…Palzer 1980;Von Broembsen 1984;Davison et al 2005;Hulvey et al 2010). Studies where more than one plant species are used, as in our study, have shown that the Phytophthora species isolated varied with baits and that this variability may have been due to changes in phenological processes of one plant species which compromised the recoveries (Smith et al 2009;Sutton et al 2009). Additionally, some Phytophthora species are attracted to certain baits and not others.…”

Section: Discussionmentioning

confidence: 59%

“…Water surveys have been popularised across the world, particularly in regions where early detection of an infested area is important to the success of containment and eradication efforts. In Oregon, Washington and California, the USDA conducts annual surveys of Phytophthora species from soil and waterways to ascertain if P. ramorum has escaped into native ecosystems (Frankel 2008;Sutton et al 2009). …”

Section: Introductionmentioning

confidence: 99%

“…Brasier et al 2003a;Hong et al 2008;Hulvey et al 2010;Reeser et al 2011;Scibetta et al 2012). Among this list are the notorious plant pathogens, P. ramorum and P. cinnamomi (Palzer 1980;Von Broembsen 1984;Smith et al 2009;Sutton et al 2009). Also commonly recovered are Clade 6 Phytophthora species which are hypothesised as having a prevalently saprophytic lifestyle (Brasier et al 2003a;Hansen et al 2012) as supported by their presence and dominance in water surveys (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Fishing for Phytophthora from Western Australia’s waterways: a distribution and diversity survey

Hüberli

Hardy

White

et al. 2013

Australasian Plant Pathol.

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During one spring season, 12 Phytophthora species, two Phytophthora hybrids, three Halophytophthora species and three Phytopythium species, were isolated from 48 waterways across Western Australia. The waterways were sampled using nylon mesh bags containing leaf baits of up to six different plant species and were isolated by plating necrotic lesions on these onto Phytophthora-selective agar media. Phytophthora species were isolated from all except one waterway. Of the Phytophthora species isolated, eight are known while the remaining four are undescribed taxa. Six of the Phytophthora species and the two hybrids are from clade 6. The two hybrids and P. inundata were the predominant species recovered.Recoveries from different plant leaf baits varied with the best two baits being Pittosporum undulatum and Banksia attentuata; and from these two combined all Phytophthora species were isolated. There was a marked difference in the Phytophthora diversity in the waterways from different regions. This is the first comprehensive study from Australia to examine the Phytophthora communities in waterways, and advances our understanding of the role of these oomycetes in natural and anthropized ecosystems.

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Section: Discussionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fishing for Phytophthora from Western Australia’s waterways: a distribution and diversity survey

Hüberli

Hardy

White

et al. 2013

Australasian Plant Pathol.

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“…present in irrigation water (Oudemans 1999, Yamak et al 2002, Gevens et al 2007, Werres et al 2007, Ghimire et al 2009, Orlikowski et al 2009). Although the incidence of sudden oak death caused by P. ramorum appears unlinked to rivers and streams (Davidson and Shaw 2003), riparian systems play an important role in early disease detection because zoospores make their way into nearby streams when P. ramorum is present in an area (Sutton et al 2009). …”

Section: Introductionmentioning

confidence: 99%

MultiplePhytophthoraspecies associated with a single riparian ecosystem in South Africa

Nagel¹,

Slippers²,

Wingfield

et al. 2015

Mycologia

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The diversity of Phytophthora spp. in rivers and riparian ecosystems has received considerable international attention, although little such research has been conducted in South Africa. This study determined the diversity of Phytophthora spp. within a single river in Gauteng province of South Africa. Samples were collected over 1 y including biweekly river baiting with Rhododendron indicum leaves. Phytophthora isolates were identified with phylogenetic analyses of sequences for the internal transcribed spacer (ITS) region of the ribosomal DNA and the mitochondrial cytochrome oxidase c subunit I (coxI) gene. Eight Phytophthora spp. were identified, including a new taxon, P. taxon Sisulu-river, and two hybrid species from Cooke's ITS clade 6. Of these, species from Clade 6 were the most abundant, including P. chlamydospora and P. lacustris. Species residing in Clade 2 also were encountered, including P. multivora, P. plurivora and P. citrophthora. The detection of eight species in this investigation of Phytophthora diversity in a single riparian river ecosystem in northern South Africa adds to the known diversity of this genus in South Africa and globally.

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“…The greater issue of how appropriately to screen a large number of plants remains unsolved, although the improved understanding of the range of symptoms that could be diagnostic (exemplified by several diagnostic guides available) and on the effects of season on the outcome is helpful. Just as helpful could be the development of reliable tools to pre-screen potential P. ramorum infections, as suggested by baiting of P. ramorum with leaves of susceptible plant such as Rhododendron and Tanoak, which has been used with success in California (Murphy et al, 2006;Aram and Rizzo, 2009) and in Oregon (Sutton et al, 2009). …”

Section: Additional Information Options To Reduce Likelihood Of Intromentioning

confidence: 99%

Scientific Opinion on the Pest Risk Analysis onPhytophthora ramorumprepared by the FP6 project RAPRA

Rossi¹

2011

EFSA Journal

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The Panel on Plant Health was asked to deliver a scientific opinion on the Pest Risk Analysis on Phytophthora ramorum prepared by the FP6 project RAPRA, taking into account comments by Member States and additional information since RAPRA. P. ramorum is the oomycete causing sudden oak death in the USA and leaf and twig blight/dieback on a range of ornamental species in North America and Europe. Currently P. ramorum is not listed as a harmful organism in Council Directive 2000/29/EC, but the Commission adopted in 2002 provisional emergency measures to prevent introduction into and spread within the EU. Recent large-scale outbreaks in Japanese larch (Larix kaempferi) plantations in the UK and Ireland have worsened the potential consequences in the risk assessment area. However, the Panel concludes that the broad narrative in the RAPRA report stands and supports its conclusion that "There is a risk of further entry (of known or new lineages and/or mating types), establishment and […] impact". It is advisable to avoid introductions of different lineages because of inherent phenotypic differences and the potential for sexual recombination. The Panel supports the management options proposed in the RAPRA report and adds further measures for consideration. Uncertainty remains over the extent to which the association between control measures and gradual reduction in the number of cases in nurseries is causal. The emergency measures have not prevented outbreaks occurring in the natural environment. The many other remaining uncertainties (fitness of progeny, hybridisation with other Phytophthora species, host range and epidemiological role of new hosts, early detection of new outbreaks, understanding of long-range dispersal, structure of plant trade networks, origin of the pathogen) call for further research on P. ramorum across Europe. 4 Editorial changes have been made on pages 51 (acronym PRA removed as it was not in line with the Panel's dictionary as discussed in Appendix 2 of the Guidance on a harmonised framework for pest risk assessment and the identification and evaluation of pest risk management options by EFSA) and 89 (statement which referred to the Panel agreeing with the RAPRA conclusion that "P. ramorum fulfils the criteria of a quarantine pest" was removed as requested by the Panel during adoption of the draft opinion). The changes do not affect the overall conclusions of the opinion. To avoid confusion the original version has been removed from the website. The scope of this Scientific Opinion is the evaluation of the RAPRA report, taking into consideration the comments of Member States as well as additional information published after finalisation of the RAPRA report, or not cited in the RAPRA report. A systematic literature search until March 2011 was carried out. It should be noted that the scientific community is concerned by the shift of P. ramorum to new hosts (with a special focus on the Japanese larch) and its further spread, and therefore new results of ongoing research are constantly be...

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Stream Monitoring for Detection of Phytophthora ramorum in Oregon Tanoak Forests

Cited by 54 publications

References 17 publications

Fishing for Phytophthora from Western Australia’s waterways: a distribution and diversity survey

Fishing for Phytophthora from Western Australia’s waterways: a distribution and diversity survey

MultiplePhytophthoraspecies associated with a single riparian ecosystem in South Africa

Scientific Opinion on the Pest Risk Analysis onPhytophthora ramorumprepared by the FP6 project RAPRA

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