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Document sans nom

Zonal Efficacy Assessments


EPPO Standard PP 1/278 Principles of zonal data production and evaluation describes the principles to be considered when designing a trials series for the generation of efficacy data to support an authorization of a plant protection product across a substantive area or region, such as across one or more distinct geographic areas or countries.  The development of the main principles for this guidance was addressed by the EPPO Workshop on Zonal Efficacy Assessments (Berlin, 2011-04-05/06).

As experience develops in this new approach to plant protection product evaluation, EPPO has assimilated a number of useful guidance materials and identified resources to assist with zonal issues.  These have been collated on this zonal web resource.


Examples of zonal efficacy evaluations

Important note: These documents are intended to assist applicants and evaluators to interpret EPPO Standard PP1/278 Principles of zonal data production and evaluation. They provide specific examples of the data required to support intended uses. It should be noted that the number and distribution of trials will vary depending on the zone and the intended use. Expert judgement should be applied in all cases.

These case studies are ‘working documents’ meaning that they may be modified over time. The approval body for these documents is the Working Party on Plant Protection Products. 

Product Pest Crop Zone
Herbicide Apera spica-venti - Loose silky bent (APESV) Winter wheat European Central Zone
Herbicide Weeds Maize European Central Zone
Fungicide Mycosphaerella graminicola - Septoria leaf blotch (SEPTTR) Winter wheat European Central Zone
Fungicide Puccinia striiformis f. sp. tritici - Yellow rust (PUCCST) Wheat European Central Zone
Fungicide Venturia inaequalis - Apple scab (VENTIN) Apple European Central Zone
Insecticide Aphids, thrips and whiteflies
Ornamental plants in greenhouses
European Union
Plant Growth Regulator e.g. manipulation of canopy structure, winter hardiness or the control of lodging Winter oilseed rape European Central Zone
Plant Growth Regulator Clarification of efficacy data requirements for the authorization of a plant growth regulator in oilseed and turnip rape in the European Northern authorization zone Oilseed and turnip rape European Northern Zone

NB. Further examples of zonal efficacy evaluations will be added here when they are completed.



Zonal maps

The map below displays the zones of comparable climate in the EPPO region as defined in EPPO Standard PP 1/241 Guidance on comparable climates for the purposes of efficacy evaluation trials on plant protection products. Please note that the borders are intentionally broad indicating that there is an area of gradual change in climate between the zones proposed.

climate mapclimate map

Zones of comparable climate in the EPPO region.


Download zonal maps : these three maps represent the EPPO climatic zones, the EU authorisation zones according to Regulation (EC) No 1107/2009, and their superimposition. They might be found a useful aid for facilitating discussions on issues regarding trial number and location.




The distribution of crops in Europe

An important consideration when determining the number and location of crop trials is identifying the distribution of crop growing regions.  The following study done by Mr Pierre Hucorne (CWRA, Belgium) provides useful information to assist research on crop distribution.  Please note that the reliability of the data is based on the sources used and crop distribution may change over time.  Expert judgement should be applied when conducting such research. 

Download the Belgian study on distribution of crops in Europe



Comparable agroclimatic zones

In establishing a zonal dossiers, not only should trials be conducted according to harmonized procedures, but the applicant and the registration authority should be able to establish the relevance of the data in relation to climate. These EPPO Standards aims to assist both regulatory authorities and applicants in determining the comparability of conditions between given areas within the EPPO region (PP1/241) and also extends the climatic comparisons globally (PP1/269).

For background on the development of agroclimatic zones see: Bouma E (2005) Development of comparable agroclimatic zones. Bulletin OEPP/EPPO Bulletin 35, 233-238.



EPPO Zonal Workshops

EPPO is holding a series of Workshops on this topic, covering all aspects of efficacy.  Follow the Workshop links for further information:


SANCO Guidance

Use the following link to access the EU Commission DG-SANCO guidance document on zonal evaluation and mutual recognition under Regulation (EC) No 1107/2009