Forestry
The sector represents a major component of Scotland’s rural economy – providing significant employment and raw materials for wood processing industries. Sustainable forest management seeks to deliver these economic benefits alongside important ecosystem services such as carbon sequestration and flood mitigation, provision of wildlife habitat and opportunities for recreation and a range of leisure activities. Pests and diseases threaten the continued long-term delivery of these benefits.
The forest area of Scotland expanded during the twentieth century through the efforts of the Forestry Commission and private owners to develop a domestic wood supply and provide rural employment. A number of introduced species, such as Sitka spruce, were key to afforestation of marginal agricultural sites and now are central to the wood processing industry. Woodland now occupies approximately 17% of the land area of Scotland and provides 44% of the GB softwood harvest, producing about 1.5 million m3 of sawn softwood. Plant health threats to the forestry sector include a number of recently introduced pests and diseases (e.g. Phytophthora ramorum, pine tree lappet moth, ash die-back), on-going management of endemic ones (e.g. large pine weevil and Heterobasidium annosum) and risks of those yet to arrive (emerald ash borer, Ips typographus and many other organisms potentially introduced through trade in plants, wood and packaging).
Knowledge Bank
Projects
This project will assess the extent of training needs across the sector, identify which nurseries participate in quality schemes, evaluate existing training resources, and highlight gaps in information and training accessibility. It will also explore how training, both practical and online, could be better delivered, consolidated, and accessed by nurseries.
The outputs will include a detailed scoping analysis of current training provision, a mapping of unmet needs, and a set of recommendations for developing and implementing a targeted training plan. This initiative will support improved plant health practices, particularly in underrepresented nursery sectors, ultimately reducing the biosecurity risks associated with plant supply in Scotland.
Image of greenhouse by Uwe Driesel from Pixabay
The study will begin by mapping stakeholders in the firewood sector, including government bodies, transport authorities, and firewood suppliers. An online survey and interviews with major firewood suppliers will help assess domestic firewood movement and identify gaps in awareness and risk assessment. The project will also explore international best practices in firewood biosecurity through literature reviews and expert consultations, as well as analyse data from firewood import records to quantify the scale of international trade. Additionally, the research will evaluate treatment interventions such as heat treatment and steam sterilization to mitigate biosecurity risks. A component of the project is the creation of resources for and recommendations around a potential future public awareness campaign designed to educate stakeholders on the risks associated with firewood movement, drawing on successful international models.
By providing evidence-based recommendations, this research aims to strengthen firewood biosecurity measures, helping safeguard Scotland’s forests from invasive pests.
Image credit: wood by günter from Pixabay
The project will conduct a systematic review of predator dietary analysis for pest detection, develop a decision-making framework for implementation, present three case studies using birds, bats, and spiders, and assess alignment with current regulatory frameworks. The review will analyse methodological developments, cost-effectiveness, and standardization opportunities, as well as evaluating ecological and technical considerations to optimize monitoring strategies, which will be brought together in a decision framework to guide future potential implementation of these approaches. The applied case studies will investigate real-world feasibility, exploring the integrating dietary metabarcoding with existing monitoring networks to potentially improve detection efficiency.
The project seeks to enhance Scotland’s pest surveillance capabilities and inform global best practices in predator diet analysis.
Through literature review, case studies and stakeholder engagement, this project will create a resource which provides specific, clear biosecurity advice to conservation practitioners so that they can produce a biosecurity management plan before a project begins, that would have the potential to become a component of licenced activities in the natural environment.
Image Credit: Wolfgang Claussen from Pixabay
A systematic framework for how to conduct risk/benefit analyses on emerging novel crops in Scotland would allow plant health risks and benefits to be considered before widespread uptake, and any mitigation strategies implemented at the earliest stage. Current and predicted examples of emerging crops in Scotland include hemp, rye, beet, flax, cover crops and novel legume and vegetable crops. Many of these examples are currently relatively low-input crops when it comes to the use of plant protection products but there may be parallels and lessons to be learnt from considering the uptake of crops, like oilseed rape or rye which are now well established in Scotland, but where pest and disease burdens have increased steadily from the point of introduction.
This project will create a systematic framework for the evaluation of plant health risks and benefits for emerging / novel crops in Scottish agriculture and will be suitable for use when considering the introduction of species in the natural environment, horticulture and forestry sectors.
Image Credit: HubertPhotographer from Pixabay
With funding from the PHC, they will run workshops over the growing season focussing on biosecurity and composting and develop protocols, based on the PHC Key Principles, for use by farm staff and allotment holders. The whole project will be celebrated toward the end of the growing season with the unveiling of a mural on one of our farm buildings. Through these efforts, Lauriston Farm aims to become a model farm of best practice for other community allotments and gardens and all protocols/guidance created would be shared across these networks.
This project will: (i) Review the evidence (including the scientific and grey literature and existing data) to identify the plant health impacts of the proposed measures within agricultural reform, with reference to Scotland’s key crops and the likely uptake of measures; (ii) Identify potential regulatory options (statutory, basic or enhanced) that could pose an emerging risk for plant health and biosecurity in the context of likely uptake of measures; (iii) Hold a stakeholder workshop to co-design best practices guidance to mitigate plant health risk whilst delivering biodiversity, climate and wider environmental goals and (iv) raise awareness of plant health risks associated with the proposed measures and disseminate best practice guidance to mitigate risk.
Image by Freddy from Pixabay
This scoping exercise will provide clarity on the biosecurity risks posed by bulk aggregates by a) engaging with the sector to understand where materials originate from, b) quantify how much bulk aggregate material is coming into GB, and c) investigate international approaches to managing the plant health risks regarding bulk aggregates.
Image by Pexels from Pixabay
This project will (i) review and collate the contemporary data and evidence on Phytophthora discovery, species description and traits; (ii) use the collated data to horizon-scan and predict disease threats in Scotland and (iii) model and map the greatest threats to plants in specific key habitats. The findings will be compiled into a report on the updated risks with recommendations for enhancing preparedness through risk-based prioritisation of hosts and habitats for targeted surveillance to promote earlier detection of Phytophthora species. Although the project will consider plants in agriculture, forestry, horticulture and natural ecosystems across Scotland, the principal focus will be on the risks to relatively under-studied plant hosts in the natural environment.
This project was selected for funding from the Project Call: “Enhancing preparedness against pests and diseases: plugging evidence gaps for Scotland”.
Image credit: Glensaugh ©The James Hutton Institute
1. Sharing the best practice for waste management with those managing waste in plant nurseries, gardens, parks and other plant handling businesses.
2. Ensuring the best practice guidance is available for those applying to become Plant Healthy certified.
3. Producing a peer-reviewed publication on plant waste management to ensure the broadest reach with plant health experts.
Publications
Scoping the risk of bulk aggregate (topsoil, sand, gravel, stone, wood chips) movement into and within Scotland
Final report and policy summary for the project PHC2023/06 - Scoping the risk of bulk aggregate (topsoil, sand, gravel, stone, wood chips) movement into and within Scotland
Identifying key questions and leverage points for plant health in the natural environment
This project used systems thinking to identify leverage points where changes in behaviour, attitudes or processes could improve biosecurity and hence plant health in the natural environment.
Assessing long-term resilience of Scottish spruce forests to climate change and novel pests: Ips typographus as a case study
Final report of the project PHC2022/04 - Assessing long-term resilience of Scottish spruce forests to climate change and novel pests: Ips typographus as a case study.
Investigation into the causes of Alder (Alnus glutinosa) mortality in Scotland
The project investigated whether alders in Scotland have experienced a recent decline in health and identified factors affecting their condition. It also aimed to improve monitoring methods and address key issues for future management and regeneration of riparian alders.
Plant Biosecurity Resources – increasing the accessibility of notifiable plant pest information for Professional Operators
This project developed 39 pest-specific datasheets and a prototype webtool for Professional Operators to provide tailored pest information to use when issuing plant passports and support risk assessments for site operations.
Biosecurity for plant health: better justification of precautionary measures
This project engaged experts and practitioners with knowledge of existing sectoral practices in Scotland, UK and internationally, summarised existing literature and undertook a gap analysis, to generate a better understanding of the rationale for taking precautions and to improve the evidence base with which to justify taking actions.
Integration of Plant Health Planning Into the Scottish Biodiversity Strategy
The impacts of introduced plant pests and diseases have been substantial in recent times. With a changing climate and many known pests on the horizon, plant health impacts on biodiversity are expected to grow further in the years ahead. Thus, considering the nature of plant health threats to the natural environment and embedding mitigating actions into biodiversity strategies is of increasing importance.
Potential of biocontrol for the sustainable management of plant diseases in Scotland: opportunities and barriers
Previous PHC projects identified biocontrol as a major element of Integrated Pest Management (IPM) with a role to play in mitigating pesticide withdrawals. However, it is currently unclear how practical biocontrol is as a suitable alternative to pesticides in Scotland, what the opportunities are for deployment across different sectors and what barriers exist to uptake (including regulatory).
Understanding a new health threat to Caledonian Scots pine (Pinus sylvestris)
This project was initiated in response to a new health threat to Scots pine manifesting itself in the form of multiple blackened cankers and dieback of shoots and branches, particularly in the lower crown. Scots pine is regarded as iconic in Scotland for a range of ecological, cultural and economic reasons. Therefore, it is a research priority to gain an understanding of the extent and causes of the canker disease for better protection of this species in the future.
Assessing spread of Phytophthoras in Scottish forests by recreational and harvesting activities using comparative qPCR and metabarcoding techniques
Pathogens from the genus Phytophthora pose some of the greatest threats to tree health and are likely to become increasingly prevalent in the UK as the climate becomes warmer and wetter. This project added new data based on a DNA metabarcoding approach to determine the Phytophthora species diversity in soil samples and sampled material from timber harvesting operations alongside those of recreational activities.
Action Research to gain a deeper understanding of large-scale biosecurity risks to Scotland
This project has developed a systems approach, in the context of plant health biosecurity risks in the retail, infrastructure landscaping and planting in the natural environment, to facilitate further understanding of key organisations and identify general and specific leverage points at which interventions could have a significant effect on the system.
Preliminary investigation into the threat of Bronze Birch Borer (BBB - Agrilus anxius) to Scotland
The Bronze Birch Borer (BBB, Agrilus anxius) is a major threat to birch trees. This project had co-funding from Scottish Forestry and NatureScot and undertook evidence gathering to assess the threat BBB poses to Scotland, inform risk assessment, surveillance and contingency planning, and identify key risks and knowledge gaps.
A targeted analysis of the impact of insecticide withdrawals in Scotland, in the context of alternative control options
Insecticides are commonly used in Scottish agricultural, horticultural, forestry production, and for amenity and natural environment management purposes. Over the last 10 years, approximately 50% of UK insecticide active substances have been withdrawn due to increasing concern over human health and environmental impacts. Some of these losses will be mitigated by using alternatives but their practicality and cost under Scottish conditions is unknown. This project analysed current crop production patterns and insecticide use in combination with how likely different insecticides are to be withdrawn and provided stakeholder views on the impacts of any such losses on their industry, including other control methods that may be adopted.
PHC Annual Report 2022-2023
The Plant Health Centre works with Scottish Government, public bodies and stakeholders to provide scientific evidence to help them make important decisions about pests and pathogens that threaten Scotland the most. Over the past 12 months we have delivered a consistent programme of stakeholder engagement and project commissioning, which are detailed in our annual report.
Biosecurity practices to support plant health: a review of knowledge and practice
This research investigated plant biosecurity risks from site visitors, tools & equipment, and large machinery. In addition to reviewing published guidance, UK businesses and organisations were engaged via questionnaires and interviews to explore how these aspects of biosecurity are understood and what procedures may be in place to address them.
Identifying the plant health risks associated with plant waste disposal and peat-free growing media and developing best practice guidance for waste disposal and composting across sectors
This research focussed on two areas of biosecurity that provide significant risk to plant businesses and the wider environment in Scotland, i) plant waste management, and ii) the constituents of reduced-peat and peat-free growing media.
Enhancing the Plant Health Centre’s communication with stakeholders
This project was commissioned to implement a selection of the recommendations made in the PHC stakeholder engagement strategy and communication plan. The team developed strategies to manage time and resources of the Plant Health Centre more efficiently regarding communication of outputs, general information on activities, aims and current issues related to plant health.
Improving knowledge of Xylella fastidiosa vector ecology: modelling vector occurrence and abundance in the wider landscape in Scotland
If introduced to the UK, the insect-vectored, bacterial plant pathogen Xylella fastidiosa could be a serious threat to trees and other plants. There is a lack of knowledge about the ecology and distributions of Xylella vectors in Scotland and the potential effects of this on any outbreak of the disease, which this project aimed to address.
A review of gene editing for the benefit of plant health
This report is the output of a call-down project that assesses the type of plant health problems in Scotland that GE could address, with potential benefits, barriers to deployment and dis-benefits noted.
Assessment of large-scale biosecurity risks to Scotland
PHC commissioned an assessment of large-scale biosecurity risks with a focus on three areas of concern:
- non-specialist and online horticulture sales;
- landscaping and infrastructure;
- planting for environmental benefits.
An additional area was the potential for modelling to support decision making across these areas of concern. This policy report summaries each report and highlights the key findings and suggested actions.
Assessment of large-scale plant biosecurity risks to Scotland from non-specialist and online horticultural sales
This project focused on an initial exploration of tree and plant biosecurity risks to Scotland arising from large-scale movement of plants via non-specialist (those for which plants are not their primary product type, e.g., supermarkets, DIY and lifestyle stores) and online plant retailers. By better understanding the characteristics of these retailer types, the plant health behaviours they undertake, and the challenges they face, potential avenues were offered for greater engagement and collaboration on biosecurity with this important, but understudied and hard to reach sector.
Assessment of plant biosecurity risks to Scotland from large scale plantings for landscaping and infra-structure projects
Planting for large-scale landscaping and infrastructure can typically involve tens of thousands of individual plants, potentially threatening plant health in Scotland due to the biosecurity risks of imports and widespread planting of infested or diseased plants. This project aimed to understand the extent and means to mitigate against such plant biosecurity risks with a focus on mapping the pathways from plant specification through to planting and establishment and highlight different biosecurity awareness for actors, in decision-making and procurement processes.
Assessment of plant biosecurity risks to Scotland from large scale tree plantings for environmental benefits
This report features five case studies from across Scotland and examines risks associated with large scale tree planting schemes, levels of awareness around pests and diseases, and how the decisions and actions of those involved can serve to reduce or exacerbate pest and disease related threats and long-term tree health. Each case study was unique in respect to their combination of location, site conditions, ownership, management objectives, species choice, supply chains and management activities. By highlighting best practice and lessons learned, it was hoped to ensure that future planting schemes can be successful and, importantly, reduce the likelihood of pests and diseases being introduced and spread into the wider environment.
The potential of ecological and epidemiological models to inform assessment and mitigation of biosecurity risks arising from large scale planting
Large scale planting projects linked to infra-structure such as transport networks and major housing projects or to planting for environmental benefits (e.g., urban greening, woodland restoration) pose high biosecurity risks due to the high number and types of plants involved. This report focusses on whether and how ecological and epidemiological model frameworks can inform assessment and mitigation of biosecurity risks from large scale planting using a combination of literature review and stakeholder engagement. The project aimed to identify priority steps to develop more useful models and tools for assessing biosecurity risks from planting in the future.
Assessment of suitability for EAB invasion for Scotland and the UK
Emerald Ash Borer (EAB) has become a significant threat to ash trees in several countries (including USA and Russia) but is not yet present in the UK. We quantified climate and ecological factors affecting EAB suitability using native range data and conclude that southern England is a highly suitable habitat for EAB. Although currently less favourable, we project that Scotland will become increasingly suitable for EAB under climate change. Thus, EAB could threaten Scotland via trade with areas where it is present or, through spread from populations if established in England or Western Europe. Rapid spread of EAB has been observed in its US invasion. We therefore recommend further study and vigilance against EAB introductions into the UK.
A stakeholder engagement strategy and communication plan for Scotland’s Plant Health Centre
The aim of this project was to develop an operational communication plan from existing stakeholder engagement principles, communication theories and knowledge banks, identifying and summarising actions for the PHC.
Metabarcoding analysis of Phytophthora diversity in spore traps and implications for disease forecasting in the P. ramorum management zone
Surveillance and monitoring of airborne pathogens is a key tool in the management of healthy forests and controlling disease outbreaks. A Scottish Forestry-funded project was carried out in autumn 2019 to validate different spore-trapping techniques for monitoring airborne P. ramorum inoculum using a species-specific qPCR assay. This project aimed to add further value to the Scottish Forestry project by investigating the suitability of DNA metabarcoding for screening spore trap samples for P. ramorum and other Phytophthora species, seeking early data for aerially dispersed Phytophthora species that may become problematic in UK forests. The study highlighted the value of both monitoring P. ramorum dispersal and detecting other Phytophthora species, to predict and understand changes in disease severity in UK tree host species. Recommendations included that the use of both rain and wind-borne inoculum capture methods might be advantageous due to the variety of weather conditions under which inoculum can disperse. Lineage testing in Southwest Scotland should be carried out to look at the prevalence of lineage EU1 in the EU2 area and to monitor for presence of North American lineages. Development of a new DNA barcode more specific to Phytophthora would be beneficial.
PHC2020/09: Economic Impact of Pesticide Withdrawals to Scotland, with Case Studies
Chemical forms of plant protection are widely used in Scottish agricultural, horticultural and forestry production plus for amenity and natural environment management purposes. The availability and use of active substances in pesticides are closely regulated and increasing concern over human health and environmental impacts has led to a greater likelihood that some existing approvals will be withdrawn and/or that approvals for new products will not be granted. Potential impacts from withdrawal of these pesticides are of policy interest and this summary report builds on the data and results from project PHC2018/15 (Potential impacts arising from pesticide withdrawals to Scotland’s plant health) and uses case studies to understand the likely magnitude and distribution of potential impacts and how they may be mitigated.
PHC2018/15: Potential Impacts Arising from Pesticide Withdrawals to Scotland’s Plant Health
The use of pesticides to manage plant pests and diseases is a key management intervention across plant health sectors, particularly in agriculture, horticulture and commercial forestry production. Pesticide withdrawals through legislation, coupled with resistance development and their impact on plant health, have emerged as key concerns for Scottish plant health stakeholders. This project quantifies the impacts on Scottish plant health that will arise from pesticide withdrawal scenarios and sets this in the context and time frame of alternative management tools.
Impact of climate change on the spread of pests and diseases in Scotland
This project constructed a modelling framework which combined epidemiological and economic modelling. The modelling framework was used to study predictions of spread and economic impact of pests which are not currently in the UK, including Xylella fastidiosa, Candidatus Liberibacter solanacearum (Zebra chip) and Ips typographus (Eight toothed Spruce Bark Beetle).
Impact: A web/desktop application is available to the PHC and Scottish Government to analyse the effects of climate change on the spread and economic impact of new threats.
Modelling Framework for invasive pests: Emerald ash borer as a case study
This project investigated whether modelling could aid preparation for a potential bark beetle and wood borer invasion of Scotland. This was achieved by: (i) reviewing suitability of modelling results and frameworks in literature; (ii) recommendations on how these could be rapidly adapted for Scottish and UK plant health context and (iii) case study on Emerald ash borer to exemplify approach.
Expansion of PHC Online Plant Health Resources
This project has expanded the PHC online Resource Bank for plant health threats to the Natural Environment sector in Scotland to include information sources for the remaining three sectors (Forestry, Agriculture and Horticulture). Information sources for Forestry, Agriculture and Horticulture were compiled and evaluated, and a Knowledge Bank relevant to each sector is now online at the PHC website, creating a comprehensive and unique signposting resource for plant health information with relevance to Scotland.
18-Month Review Summary Leaflet
The Plant Health Centre completed an in-depth review of its first 18-months of activity for our funder (the Scottish Government through RESAS) in September 2019. While the full report is not yet available to the public, we have created a summary leaflet that outlines out achievements over this period.
Threat: Oak Processionary Moth
Status, Scottish specific issues, Plant Health Centre perspective and Key priorities and recommendations concerning the threat from Oak Processionary Moth to Scotland.
Threat: Bud worm
Status, Scottish specific issues, Plant Health Centre perspective and Key priorities and recommendations concerning the threat from the Eastern spruce budworm (Choristoneura fumiferana), Western spruce budworm (C. freeman) and Black headed budworm (Acleris gloverana and A. variana) to Scotland
Threat: Emerald ash borer and Bronze birch borer
Status, Scottish specific issues, Plant Health Centre perspective and Key priorities and recommendations concerning the threat from Emerald ash borer and Bronze birch borer to Scotland
Threat: Larger Eight toothed spruce bark beetle (Ips typographus)
Status, Scottish specific issues, Plant Health Centre perspective and Key priorities and recommendations concerning the threat from the larger eight toothed spruce bark beetle (Ips typographus) to Scotland
Threat: Longhorn beetles
Status, Scottish specific issues, Plant Health Centre perspective and Key priorities and recommendations concerning the threat from longhorn beetles to Scotland
Threat: Phytophthora ramorum
Status, Scottish specific issues, Plant Health Centre perspective and Key priorities and recommendations concerning the threat from Phytophthora ramorum to Scotland
Threat: Xylella fastidiosa
Status, Scottish specific issues, Plant Health Centre perspective and Key priorities and recommendations concerning the threat from Xylella fastidiosa to Scotland
Development of an online, user friendly plant health resource bank for the Scottish Natural Environment
The aim of the project PHC2018/11 was to compile a resource to be embedded within the Scottish Plant Health Centre (PHC) website, with the following three main purposes: 1) To direct users to existing, comprehensive and reliable plant health information resources; 2) To provide information on selected plant health threats to the natural environment, particularly invasive non-native species; and 3) To direct users to appropriate government agencies and resources and advise users on steps to take should a suspected statutory pest or disease be encountered.
Webpages have been developed which provide the following:
1) a listing of the first most pressing plant health threats to the natural environment in Scotland;
2) a user-friendly web template, populated with links to information about these major threats and other topics relevant to plant health in the Scottish natural environment; and
3) summary pages providing guidance on biosecurity and control of diseases in this sector, for which other resources were not easily available.
The use of mobile technology to enhance plant health monitoring and awareness in Scotland
The aim of the project was to review existing websites and smartphone apps currently available and applied in the plant health sector and to assemble a detailed overview covering the following points:
- What options are available in terms of mobile software applications for plant health?
- What is their primary purpose?
- Who is the target audience (growers, plant health professionals, citizen science, …)?
- Which plant health sectors do they cover?
- Are they reliable and accurate?
- Is information submitted to a central database? If so, how is this information used?
- Could they be used globally, or are they limited to certain geographic regions?
Difficult choices to protect gardens and the environment
Heritage gardens play an important role in plant conservation. They house collections gathered over decades or even hundreds of years, including varieties of plants that may be overlooked elsewhere, fostering heirloom varieties and preserving biological diversity that is the raw material of adaptation. As well as being beautiful and tranquil sites of cultural heritage, these ex-situ resources are treasure troves of biological diversity. Arduaine Gardens shows us that tough choices can be necessary and important to preserve these collections and the surrounding environment.
Spatio-temporal modelling of great spruce bark beetle (Dendroctonus Micans) in Scotland
This project conducted a proof of principle study to assess whether developed computational tools could add value to the field data in annual surveys by Scottish Forestry to parameterise models of the spread of Dendroctonus Micans in space and time. The fitted model was also used to project scenarios of future spread.