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The EPPO Plant Protection Thesaurus (EPPT) covers organisms important in agriculture and crop protection: crops, pests (including pathogens and weeds), natural enemies, and organisms used in ecotoxicological studies. EPPT includes the core data files of the Bayer codes which were previously available as a set of books or data files. This coding system is now managed by EPPO and Bayer codes can now be called EPPO codes.
For each organism EPPT provides:
- preferred scientific name
- EPPO (Bayer) code
- other scientific names
- common names in many languages
- taxonomic relationships and other classifications
Searching EPPT
Click the ‘Search’ button on the left-hand side of ... read mode
Click the ‘Search’ button on the left-hand side of this web page to open the search page of EPPT. Enter either a name (Latin or common name) or an EPPO code for the organism or group of organisms you are interested in (click the button ‘Search’ or use ‘enter’ on your keyboard). The results of your search will appear at the bottom of the page. Click on the name of the organism (or group of organisms) to view all details in a new EPPT page.
View an example
If you enter ‘ Helicoverpa’, the database will display ... read mode
If you enter ‘ Helicoverpa’, the database will display all names and codes related to this genus (both genus itself and species belonging to it). Here, we have chosen to view the details about the species ‘ Helicoverpa armigera’
 
At the top of the page, the preferred name ‘Helicoverpa armigera’ and the EPPO code ‘HELIAR’ are displayed. This page can be printed or bookmarked (click on the appropriate icons). For most organisms which are also included in PQR (EPPO database on quarantine pests), the presence of the relevant icons shows that there is a map of geographical distribution (image and legend) and/or documents related to the pest species (i.e. articles from the EPPO Reporting Service). These will eventually be provided for all such organisms in PQR.
For each organism, EPPT displays other scientific names (e.g. synonyms) and elements of taxonomy. You can navigate within the taxonomic tree by clicking on the button ‘Explore taxonomy’. EPPT also provides common names in different languages (each language is indicated by its ISO code within square brackets). EPPT also shows groups which had earlier been defined by Bayer (‘Bayer taxonomic group’).
At the bottom of the page, there are two options. On the left hand-side, you can show the authorities for all Latin names by ticking the box ‘show authorities’ and clicking on the ‘Filter’ button). On the right hand-side, you can restrict the display to scientific names or to a single language (not all languages are available for every species).
Advanced searching
Search modes
Different search modes are available:
‘Whole word’: searches for a complete word
‘Starting with’: you can start by typing the first 3 letters (minimum).
‘Containing the word’: searches for a word within an expression.
‘Use soundex algorithm’: is a tool which facilitates searching when you are unsure of the correct spelling of the organism name.
e.g. if you enter ‘phytoftora’, the system will be able to find ‘phytophthora’ or if you enter ‘Elodia canadense’, it will similarly find ‘Elodea canadensis’.
‘Find children’ will help you display the different taxonomic levels which are below the level entered in the taxonomic tree. It is usually helpful to restrict the search language to ‘scientific’ to better view the taxonomic relationships.
e.g. if you enter ‘Liliaceae’ the database will display all genera and species which belong to this plant family.
Type of entity
By ticking one or more of these boxes, you can restrict your search to different types of entity: plant, animal, and microorganism. The option ‘group classifier’ allows you to search within taxonomic groups only.
Search language
By choosing a specific language in the drop-down menu ‘Search a language’, you can restrict your search to scientific names (i.e. Latin with the exception of viruses) or to common names. Note that for a given organism, common names may not be available in all languages proposed.
Search by
You can restrict your search to names or codes only (or not by selecting both). For example : if you type 'sphe' and restrict your search to codes, you will obtain 1 code SPHECE (code for Didymella exitialis). If you restrict your search to names you will obtain all organism whose names are starting with 'sphe' (eg. Sphecia, Sphecidae, Sphecius, etc.)
Results per page
You can choose the number of records displayed on a single web page to tailor it to your screen dimensions (‘Results per page’). If the results are generated over several pages, you will then be able to navigate from one page to another.
Mozilla Firefox plugin
For those who are using Mozilla Fixefox as a web browser, you can download here and install an EPPT search plugin. This plugin will allow you to access and search EPPT directly from your web browser. It adds an icon to the search box in the menu bar that searches EPPT directly.
Licensed user: what does this mean?
Because EPPO codes (formerly Bayer codes) have essentially been designed for computing purposes, some users of EPPT may wish to incorporate the core data files of EPPT directly into their own information systems. In order to do so, a license must be obtained from the EPPO Secretariat (see EPPO webpage on EPPT).
On a yearly basis, licensed users will be provided with an ID and password, allowing them to enter the restricted area of this website.
In this restricted part, licensed user can - download EPPO Codes - request new codes - access a forum
Last update : 2013-05-16 |