Efficacy Evaluations and Guidelines
This guidance is to help you complete the Efficacy section of a pesticide application.
What is Efficacy?
Efficacy can be defined as determining the effectiveness of a substance, including identifying the appropriate dose and mode of action, and identifying any adverse or unintended negative impacts. In regulatory assessments, the relevant claims of the proposed product must be supported by data. These data are generated from appropriately conducted trials, following relevant guidance and are provided to address regulatory requirements.
Efficacy assessments for plant protection products (PPP)
Efficacy consider whether the claims made on the product labels are supported by data. HSE considers the relevance of the proposed uses to UK effectiveness, risk to the crop and resistance issues. We consider whether there is a demonstrated benefit (to the crops or in non-crop situations) and put into context with any identified adverse impacts (for example damage caused to the crop).
HSE considers the directions on the label to ensure they are appropriate to the use of the product. This contributes to using the product in a targeted, responsible manner optimising its' use as part of integrated control programmes with other measures, but ensuring it is the minimum required.
Data requirements and accompanying guidance
Data supporting GB and NI authorisations for a plant protection product (PPP) should follow the appropriate guidance (EPPO, see below) and address the relevant data requirements for the active substance and the formulated product.
European Plant Protection Organisation (EPPO)
EPPO is an international organization responsible for cooperation and harmonization in plant health and protection within the European and Mediterranean region. The UK has been a member of EPPO since its creation in 1951, and membership has grown to over 50 countries. HSE provides expertise on a number of PPP related panels and expert working groups.
EPPO produce standards on how to approach Efficacy evaluations, which are recognised in regulatory regimes, including the UK, EU, FAO and OECD. These range from general standards addressing regulatory data requirements (such as Phytotoxicity (PP 1/135)) to standards describing the conduct of individual efficacy trials (such as aphids on cereals (PP 1/020)).
Data generated outside the UK
Data generated outside the UK may be used to support UK products, provided there is an appropriate case for relevance to UK agronomic conditions. EPPO PP 1/278 'Principles of zonal data production and evaluation' provides a comprehensive overview of the relevant issues when generating and using regionally based data. Further information is provided in 'Efficacy Guideline 106 - General principles on generating Efficacy data'.
However, in some situations, where guidance is not harmonized via EPPO or in a limited number of UK specific situations, additional UK guidance is relevant and must be followed (eg for resistance management).
UK Additional Guidance
Below is further current guidance that applicants should refer to when making an application for uses in the UK. Included are guides and information on UK crops/situations, with details of relevant UK targets; and UK resistance management and labelling. This may assist applicants in trials planning, summarising data and supporting UK label claims. Please note that non-UK generated efficacy data may be used to support UK uses, provided there is an appropriate case for relevance to UK agronomic conditions. In this regard, EPPO PP 1/278 provides a key overview of the relevant issues on generating and using regional data packages. In future a range of comprehensive crop guides will be produced.
General Guidance on Generating Data and Submitting Applications
- 101 - Guidelines for the preparation of a Biological Assessment Dossier.
Revised May 2008 Also see EPPO Standard 1/181.
- 105 - Formulation changes and use of EPPO PP 1/307
Revised January 2021
- 106 - General Principles on Conducting Efficacy Trials to Support UK Plant Protection Products (PPP)
Revised January 2021
- 110 - Official Recognition of Efficacy Testing Organisations.
Revised July 2012
- 117 - Groundwater metabolites - guidance on efficacy aspects
- 119 - Rainfastness of foliar applications
New January 2022
Application or Situation Specific Guidelines
- 211 - Efficacy Data Requirements for Home Garden Products.
- 212 - Efficacy guidelines for labelling of amateur use products.
Crop Safety Guidelines
303 - Effects on Non-Target Crops of Highly Active Herbicides – Including Mixtures and Sequences
Crop Specific Guidelines
- 403 - Provision of information on tree canopy size in efficacy and residue trials in apple orchards.
- 405 - Data requirements for Oilseed Rape and Vegetable Brassicas.
- 406 - Data requirements for Turf Fungicides, Herbicides, Insecticides and Plant Growth Regulators.
- 407 - Data requirements for Cereals and Maize.
- CG01 - Crop Guide on Potato.
- CG02 - Grassland
Revised January 2021
- Working Document -
A summary of the major UK Pests for various crops.
Chemical and Control Specific Guidelines: Resistance Management and tank mixtures/sequences
- 601 - Resistance Warnings on Labels of Insecticide and Acaricide Products.
Revised May 2008.
- 602 - Resistance Warnings and Restrictions on Labels of Professional Herbicide Products.
Revised Sept 2007.
- 603 - Fungicide Resistance: label advice and restrictions.
Draft issued February 2008.
- 604 - Efficacy Data Required For Tank Mixtures and Sequences of Pesticides.
- 606 - Resistance risk analysis and use of resistance management strategies.
Revised May 2008.
- 611 - Guidance on the Restriction of Use of High Resistance Risk Herbicides.
Issued June 2007.
- 617 - Re-registration of Triazole uses in cereals: fungicide resistance issues
Issued July 2012.
Other efficacy related guidance
- 'Efficacy Assessments: UK Product Labelling and National Issues/Addenda
Applicants are advised to use a dRR when submitting an Efficacy UK Addenda. This annotated version includes advice on when a UK-specific addendum would be required, and what information would be expected in this document. It also includes efficacy related UK labelling requirements, including claims for levels of control. This is currently a DRAFT document.
- Tank mixture of plant protection products – Updated UK Requirements
- Qualified recommendations
Advice on data requirements for including qualified recommendations for minor use on product labels.
- Groundwater metabolites
Further to SANCO/221/2000-rev.10, issued 25 February 2003, CRD provides additional advice on the efficacy aspects of determining relevant groundwater metabolites in Efficacy guideline 117 - Groundwater metabolites - guidance on efficacy aspects (issued 14 October 2010, pdf, 6 pages, 140 kb).