New approaches for the early detection of tree health pests and pathogens

Lead Research Organisation: University of Aberdeen
Department Name: Inst of Biological and Environmental Sci

Abstract

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Technical Summary

This project has 6 work packages (WP), each based around a different combination of skills and expertise. For WP2-6 there will be a focus on a particular detection technology, while WP1 will provide the technical oversight needed for effective deployment of these different technologies, as summarised:
WP1:a participatory interdisciplinary approach will be used to evaluate the needs of stakeholders and to ensure that the technologies meet these. It will also focus on the requirements of effective technology deployment, using mathematical modeling to develop sampling strategies, to create network-based risk maps and economic assessments of cost-effectiveness. Further aspects of deployment will be analysed using social science approaches including end-user acceptability and the potential for using citizen science.
WP2:analytical chemistry approaches will be used to identify diagnostic volatile organic compounds produced by pests, pathogens and diseased hosts and to translate these onto commercial-available portable platforms for use by inspectors in the field.
WP3:multispectral imaging will be used to identify markers for the early detection of biotic/abiotic stress in plants. A prototype bioimaging camera will be constructed that can be used to validate this approach in the field.
WP4:will develop mathematical models of spore movement and investigate metagenomics for broad-spectrum surveillance utilizing existing monitoring networks e.g. pollen traps. In addition, a novel integrated cyclone-based trapping and molecular detection system will be developed and evaluated.
WP5:novel semiochemical attractants will be identified for a range of wood-boring beetle pests, incorporated into traps designed for efficient detection and then deployed in a risk-based network.
WP6:methods for sampling and rapid screening water for Phytopthora spp., including 'unknowns' will be developed and validated. This will combine high-throughput sequencing with a rapid bioinformatic.

Planned Impact

The interdisciplinary design of this proposal will ensure maximum ongoing impact. Central to this is stakeholder engagement and our proposal has adopted a novel approach to facilliate this. Traditional approaches to developing new detection or diagnostic technologies have assumed the 'build it and they will come' approach; where the focus is on the technical aspects of the novel methodology, rather than the needs of end-users and the specifics of how it will be effectively deployed. This proposal reverses that by taking an inclusive view of what is required to achieve a successful outcome i.e. the deployment of a new technology that improves our biosecurity, and then co-designs technologies which fit that purpose. It achieves this by embracing an interdisciplinary approach and through establishing early engagement with stakeholders and end-users. Critical to this is the creation of a Learning Platform (Work package 1) which sits at the core of the project and cuts across the other technology-driven work packages (WPs 2-6). This platform will create communication channels, facilitate collaboration and knowledge sharing across work packages and stakeholder groups, actively disseminating project outcomes and enabling the pathways to impact. This will be delivered as a series of workshops; both cross-cutting (looking at the broader issues associated with detection and its successful deployment) and more focused (looking at specific issues associated with a particular technology and the contexts for its use). In addition to interacting with stakeholders (e.g. policy-makers, inspectors, NGOs, industry), this approach will use the breadth of expertise established within the consortium and assembled from across a wide-range of disciplines. This brings together 'technology-owners' (natural and physical scientists) with 'technology-evaluators' (mathematical and social sciences) to ensure that the best technological approaches are married with suitable sampling and risk-based deployment strategies, that they have stakeholder acceptability and offer genuine cost-efficiency benefits to public and private stakeholders alike.

In addition to the novel approach built into the project design, the effective delivery of impact will also benefit from a consortium which has an extremely strong track record of delivering translation science, to policy and industry alike. As government science agencies, the major remit for both Fera and Forest Research is to take science and technology and to translate it into policy-focused tools and evidence. This is a role they provide routinely for Defra and Forestry Commission, and their associated inspectors on the frontline in the field (e.g. Fera PHSI and FC Inspectors). In terms of delivery of technologies to end-users including industry, there is also a strong track record across the consortium in a whole range of contexts e.g. Worcester (horticulture industry diagnostics), JHI (potato industry diagnostics), Greenwich (pest trap deployment) and Fera (field diagnostics deployment). The integration of a number of SMEs within the consortium is another pathway to impact; providing a route for new technologies to be made freely available beyond the end of the project. Finally as plant and tree health sits within a European regulatory framework, the ability to engage with international partners and stakeholders is important. The consortium has a wealth of experience and contacts in this area, in particular through its central role in a range of related EU-funded projects e.g. Q-Detect (Fera-led), ISEFOR (Aberdeen-led) and PERMIT (FR-led). It will also build upon existing systems for knowledge exchange within our region, especially through the use of the European Plant Protection Organization (EPPO). By working with EPPO, using activities such as its workshops and conferences, we will be able to reach out to tree health practitioners across Europe; in many cases the real frontline for UK biosecurity.

Publications

10 25 50
 
Description We determined volatile organic compound signatures from a number of fungi and oomycetes in order to develop detection methods for these invasive organisms in plant-based substrates.

Ceratocystis platani, cause of wilt/canker stain of Platanus trees (e.g. London plane) was the main fungus examined. Eight different isolates of the fungus, six from Europe and two from the USA (one each from North Carolina and California), were cultured and volatile compounds analysed from the gases above the cultures. Based on the volatile compounds detected, most isolates from Europe grouped together, along with the isolate from California; in contrast, the isolate from North Carolina produced different volatile compounds, in terms of composition and quantity. It is possible, therefore, that the strain of C. platani inadvertently imported into Europe in the 1940s came from California, although more isolates of the pathogen from California and North Carolina should be analysed to confirm this hypothesis. The volatile organic compound signatures obtained for C. platani present a potential new method for the rapid detection of the pathogen in plant materials in Europe.

The same method was used to distinguish between a range of Phytophthora species utilizing volatile organic compound signatures. Phytophthora species include some of the most threatening pathogens of plants known, causing diseases resulting in economic and yield losses in agriculture and horticulture, and severe damage to natural and semi-natural ecosystems. We examined the volatile organic compounds produced by 13 species of Phytophthora, representing nine of the ten clades known within the genus. Included amongst these species were Phytophthora cinnamomi and P. x cambivora, species that cause severe damage in horticulture and forestry. Accounting for volatiles arising from the culture media was difficult, but eventually overcome. Examination of the volatile signatures using principal components analyses showed that the different clades of Phytophthora were clearly separated. These analyses support the further investigation of volatiles produced by Phytophthora species to be used in the early and rapid detection of threatening organisms in plants, plant growth substrates (composts) and plant products. The method might also be used to determine the presence of Phytophthora species in forest soils, enabling more accurate and rapid mapping of the extent of infestations in natural ecosystems.

Preliminary experiments were made with the bacterial pathogen Pseudomonas aesculi, cause of bacterial canker of the ornamental tree Aesculus hippocastanum (horse chestnut). We were able to determine the changes in volatile organic compounds emitted by the bacterium over a period of incubation of 9 days. Volatile profiles, however, were similar over the whole incubation period, suggesting that detection of the pathogen on infected horse chestnut trees is possible. Further work is required to determine if the volatiles emitted by Pseudomonas aesculi can be used to distinguish between this pathogen and related species in the Pseudomonas syringae group.
Exploitation Route These findings provide the basis for development of 'sniffer' technologies in the rapid detection of potentially damaging fungi, oomycetes and bacteria in plants, plant growing substrates and plant products. Current developments in medicine, based on analysis of volatile compounds in breath parallel this work and provide additional support to the idea that volatiles analyses could be used to detect plant pathogens.
The availability of such a method will greatly increase the abilities of plant biosecurity personnel at ports of entry into a given country to screen plants and plant products for potentially invasive and damaging organisms. The next step is to develop an industrial partnership to take the technology forward.
Sectors Agriculture, Food and Drink,Environment

 
Description PROTECTA:
Amount € 315,000 (EUR)
Funding ID N/A 
Organisation European Union 
Sector Public
Country European Union (EU)
Start 08/2018 
End 07/2022
 
Description Annual Meeting of the Scottish Arboricultural Association, Falkirk, January 30th 2016. 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Professional Practitioners
Results and Impact Invited oral presentation entitled 'Invasive Pathogens: Major Threats to Trees in the UK.' Also received an award for 'Outstanding Services to Scotland's Trees'
Year(s) Of Engagement Activity 2016
 
Description IUFRO 125th Anniversary Conference, Freiburg, Germany, September 2017 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Professional Practitioners
Results and Impact Presentation entitled 'Discrimination between species of Phytophthora using volatile organic compound signatures'. IUFRO 125th Anniversary Conference, Freiburg, Germany, September 2017.
Year(s) Of Engagement Activity 2017
 
Description Invited presentation to conference 'Interactions between The Pine Wilt Disease' 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Professional Practitioners
Results and Impact Presentation entitled 'Interactions: Host Tree - Fungi - Insects'. A conference paper was produced in relation to this activity.
Year(s) Of Engagement Activity 2018
 
Description Joint 2014 Annual Meeting British Ecological Society and Société Française d'Ecologie 9 - 12 December, Grand Palais, Lille, France. 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Professional Practitioners
Results and Impact Keynote oral presentation entitled 'Alien invasive pathogens: the major threat to forest ecosystems.'
Year(s) Of Engagement Activity 2014
 
Description Meeting of the Northeast Scotland Foresters Association 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach Regional
Primary Audience Industry/Business
Results and Impact Fusarium circinatum was included in a talk entitled 'Major Disease Threats to Trees in the UK'.
Year(s) Of Engagement Activity 2017
 
Description XVII Congress of the European Mycological Association, Funchal, Madeira. September 2015 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Professional Practitioners
Results and Impact Invited oral presentation entitled 'Alien invasive pathogens threatening European forest ecosystems'.
Year(s) Of Engagement Activity 2015