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Legislation for tree health

Tree health is regulated under plant health legislation. This is required and implemented to promote safe trade and protect the environment.

Published: 01 Jul 2025

Topic: Manage forests

Key pieces of legislation

Three key pieces of legislation apply in the UK. 

Originating from the EU, this assimilated law is now domestic law. 

Domestic enforcement legislation enables the Scottish Ministers to carry out their obligations and enforce the rules detailed in the legislation below.  


The Plant Health (Official Controls and Miscellaneous Provisions) (Scotland) Regulations 2019

This domestic enforcement legislation contains powers under which Scottish Forestry undertake tree health regulatory actions such as:

  • inspections
  • issue of Statutory Plant Health Notices

The Plant Health (Official Controls and Miscellaneous Provisions) (Scotland) Regulations 2019 (legislation.gov.uk)

Plant Health Regulation 2016/2031

The ‘PHR’ outlines rules for a risk-based approach to managing plant health threats. 

It lists the systems and requirements authorities must put in place including:

  • maintaining and updating lists of controlled plant pests
  • conducting regular, systematic surveys to detect these pests following standardised methods
  • developing emergency plans for serious outbreaks
  • managing a plant passport system so plants can be traced back to their original source

It also states the obligations of professional operators and other persons.

Regulation (EU) 2016/2031 of the European Parliament of the Council

Importing plants, plant products or seeds?

Find the latest rules using the ‘Plant health information and import rules service’ 


Phytosanitary Conditions Regulation 2019/2072

The ‘PCR’ establishes protective plant health measures to implement the PHR. 

Measures taken to prevent introductions and control the spread of plant pests and diseases differ according to the risk category the pest or disease is assigned to. 

Key differences between categories of plant pests and diseases listed in PCR Annexes relate to:

  • their presence in the UK
  • the purpose of classification 
  • where authorities focus action to address the threat posed

Phytosanitary Conditions Regulation 2019/2072 (legislation.gov.uk)

CategoryUK presencePurposeFocus
Priority pestNot or limitedHighest risk quarantine pests requiring enhanced preparationEradication or containment, enhanced monitoring, contingency plans, public awareness campaigns
Quarantine pestNot or limitedEarly detection and prevention of major threatsEradication or containment
Provisional quarantine pestNot or limitedPrevention of suspected major threatsEradication or containment
Regulated non-quarantine pestPresentPrevention of further spreadInspections and containment
Pest Free Area pestNot present in Pest Free AreaPrevent entry to Pest Free AreaEnhanced surveillance, movement restrictions
Pests subject to temporary measuresUncertainReduce risk of introductions pending further informationTemporary restrictions such as emergency import bans while Pest Risk Assessment is conducted
This table provides a generalised summary for illustrative purposes


The Commission Delegated Regulation (EU) 2019/1702 

Priority pests are listed under this legislation. These are pests for which their potential economic, environmental or social impact is the most severe in respect of Great Britain. 

See our table with the subset of priority pests that affect trees. 

Use the direct links to the UK Plant Health Risk Register for detailed pest risk assessment information.

The Commission Delegated Regulation (EU) 2019/1702 (legislation.gov.uk)

Common nameScientific nameUK Plant Health Risk Register entry
All web links provide details for a given plant pest or disease entry on the UK Plant Health Risk Register (external website)
Bronze birch borerAgrilus anxius13041
Emerald ash borerAgrilus planipennis25310
Citrus longhorn beetleAnoplophora chinensis13295
Asian longhorn beetleAnoplophora glabripennis1786
Plum and peach longhornAromia bungii26575
Canker stain of planeCeratocystis platani22882
Pitch canker of pineFusarium circinatum12365
Small spruce bark beetleIps amitinus16009
Northern bark beetleIps duplicatus16011
Eight-toothed spruce bark beetleIps typographus16019
Pine processionary mothThaumetopoea pityocampa10607
Oak processionary mothThaumetopoea processionea7319
Xylella fastidiosa (all strains and subspecies)Xylella fastidiosa12750

Official Controls Regulation 2017/625

The plant health sections of the ‘OCR’ set out checks authorities will conduct to ensure compliance with the PHR rules. Checks are conducted across the supply chain including any premises where plants or plant products are grown, stored, transported, processed or sold.

Under the OCR, competent authorities can:

  • inspect premises without prior notification 
  • collect samples to test for pests or diseases
  • refuse goods from entering Great Britain that do not meet plant health standards
  • require treatment, removal or destruction of non-compliant material

Official Controls Regulation 2017/625 (legislation.gov.uk)

Plant Health Act 1967

This Act is the primary legislation governing plant health in Great Britain. It defines competent authorities for plant health and grants them powers to make secondary legislation to:

  • prevent the introduction and spread of tree pest and diseases
  • create plant health offences
  • charge fees for some operations

Plant Health Act 1967 (legislation.gov.uk)

What is a Statutory Plant Health Notice?

A Statutory Plant Health Notice (SPHN) is a legal Notice requiring you to take:

  • certain steps to treat, destroy or dispose of a controlled plant pest or prohibited material
  • or other actions to prevent the establishment or spread of a controlled plant pest

SPHNs are issued: 

  • by plant health authorities including Scottish Forestry under The Plant Health (Official Controls and Miscellaneous Provisions) (Scotland) Regulations 2019
  • to land owners or managers when controlled plant pests or prohibited material are found 

Your SPHN will state what you are required to do, where, and within what timeframe.

Measures required in tree health SPHNs may include:

  • removing particular tree species within a certain distance of infected or symptomatic trees
  • chipping or debarking felled trees on site
  • carrying out extra biosecurity measures
  • notifying your local Conservancy when measures are complete 

Contact your local Conservancy office with questions about your SPHN.

Contact your local Scottish Foresty office

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