Phosphonate controls sudden oak death pathogen for up to 2 years

Garbelotto, Matteo; Schmidt, Doug

doi:10.3733/ca.v063n01p10

Cited by 40 publications

(56 citation statements)

References 18 publications

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“…There have been attempts to manage through regulation (HRI P. ramorum Industry Working Group, 2008;COMTF, 2008a), and regional-scale eradication attempts are ongoing in Oregon and the UK (Goheen et al, 2004;Kanaskieet al, 2009aKanaskieet al, , 2009bHansen et al, 2008;Forestry Commission Great Britain, 2011). In California, the pathogen became established in wildlands faster than eradication attempts could be mounted, but we have observed numerous small-scale neighborhood or single-property management attempts at the wildland-urban interface (Alexander & Lee, 2010) as well as ongoing management experiments that are slowly establishing the efficacy of individual management techniques at a larger scale (Valachovic et al, 2008;Garbelotto & Schmidt, 2009;Swiecki& Bernhardt, 2009). …”

Section: Suggestion Literature Source/examplesmentioning

confidence: 99%

Evolution of an Invasive Species Research Program and Implications for Large-Scale Management of a Non-native, Invasive Plant Pathogen

Lee¹,

Alexander²,

Frankel³

et al. 2012

ENRR

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We conducted a research needs assessment (RNA) in 2010 to gather opinions of "experts" and a larger public on research priorities for Phytophthora ramorum, the pathogen that causes sudden oak death in forest trees and Ramorum blight in ornamental plants. We place these 2010 findings in context with findings of similar P. ramorum needs assessments from 2002 and 2007-2008 and with a comprehensive literature review published in 2010. P. ramorum research needs have evolved from an emphasis on basic biological information toward an emphasis on management. As with many other non-native, invasive organisms, a major challenge remains how to move P. ramorum research into more wide-scale, unified attempts at management. Our analysis suggests that successfully moving from basic research to on-the-ground management requires overcoming the tendency toward specialized, limited viewpoints and providing stakeholders a comprehensive, integrated picture of the necessity and possibility of managing this plant disease.Keywords: research needs assessment, Phytophthora ramorum, sudden oak death, invasive species management IntroductionResearch needs assessments (RNAs) are important tools that allow scientists, research organizations, and policy makers to assess the state of knowledge and identify the most fruitful areas for future research. A cursory review of the scientific literature reveals numerous RNAs, often conducted at regular intervals. The existence of RNAs within a field of study indicates a degree of disciplinary self-awareness and care for the progress of the field.

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Section: Suggestion Literature Source/examplesmentioning

confidence: 99%

Evolution of an Invasive Species Research Program and Implications for Large-Scale Management of a Non-native, Invasive Plant Pathogen

Lee¹,

Alexander²,

Frankel³

et al. 2012

ENRR

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“…Phosphonates are officially approved to control Sudden Oak Death associated with P. ramorum (Garbelotto and Douglas, 2009) in California and "Jarrah" dieback associated to P. cinnamomi (Jakson et al, 2000) in Australia and some reported experiments reveal phosphonate efficacy in many others Phytophthora host interactions (Wilkinson et al, 2001). A range of responses to phosphonate application are also reported depending on the plant species and time of application (Wilkinson et al, 2001;Navarro et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Systemic Immunity Against Soil Borne Phytophthora and Control of Ink Disease of Chestnut by Foliar Spray of Potassium Phosphonate

Gouveia¹,

Coelho²,

Fonseca³

et al. 2010

Acta Hortic.

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Chestnut ink disease represents a great risk for chestnut (Castanea sativa Mill.) in all regions of chestnut production of Europe and North America. Induced by soil borne oomycetes, Phytophthora cinnamomi and P. cambivora, both parasites infect the root system and cause root and collar rot resulting in dieback, decline and finally, the death of infected trees. There are no single control measures for root rot pathogens and control with systemic and selective oomycetes biochemical substances can be important as part of the integrated disease management of these soil borne parasites. In this work we studied the effect of potassium phosphonate to protect roots from P. cinnamomi. Chestnut seedlings were planted in potting mix previously inoculated with P. cinnamomi (Pr 120). One group of five pots, with three seedlings each were submitted to potassium phosphonate foliar spraying (3 ml L -1 Atlante ® ) and another group of five pots were water foliar sprayed. Seedlings had been grown in a nursery for 120 days. At the end of the experiment, visual symptoms of the crown and root system were assessed. Parameters related with roots: root length, root rot length, root number, root rot number, crown diameter, height and biomass were evaluated. Statistic significant differences between treatments were obtained in all root studied variables. Potassium phosphonate by foliar spraying prevented P. cinnamomi infections of roots of chestnut and can be a key factor in the management of ink disease of chestnut.

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“…This work also shows that a reduction in inoculum level, rather than an elimination of inoculum, can affect the epidemic. Garbelotto and Schmidt (2009) report that a method consisting of an azomite soil amendment and bark lime wash was always ineffective, and did not reduce P. ramorum growth and infection rates. However, phosphonate treatments were shown to be effective in slowing both infection and growth rates for at least 18 months (Garbelotto and Schmidt, 2009).…”

Section: Options To Reduce Infestation and Magnitude Of Impact In Thementioning

confidence: 99%

“…Garbelotto and Schmidt (2009) report that a method consisting of an azomite soil amendment and bark lime wash was always ineffective, and did not reduce P. ramorum growth and infection rates. However, phosphonate treatments were shown to be effective in slowing both infection and growth rates for at least 18 months (Garbelotto and Schmidt, 2009). This study builds on the work on phosphonates by Garbelotto and colleagues already cited in the RAPRA report (there is now also a phosphonate study from Oregon, with disappointing results on seedlings (Kanaskie et al, 2010b)).…”

Section: Options To Reduce Infestation and Magnitude Of Impact In Thementioning

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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Phosphonate controls sudden oak death pathogen for up to 2 years

Cited by 40 publications

References 18 publications

Evolution of an Invasive Species Research Program and Implications for Large-Scale Management of a Non-native, Invasive Plant Pathogen

Evolution of an Invasive Species Research Program and Implications for Large-Scale Management of a Non-native, Invasive Plant Pathogen

Systemic Immunity Against Soil Borne Phytophthora and Control of Ink Disease of Chestnut by Foliar Spray of Potassium Phosphonate

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

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