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Julius Kühn-Institut (JKI)
Federal Research Centre
for Cultivated Plants

Dr. Bernhard C. Schäfer

Messeweg 11/12
38104 Braunschweig, Germany

Ms Simone Wittke
Tel: +49 (0)3946 47 7501
Fax: +49 (0)3946 47 7502
E-mail: ag@  julius-kuehn.  de

Stahnsdorfer Damm 81
14532 Kleinmachnow, Germany
Fax: +49 (0)33203 48-385

Institute leaflet
Institute booklet

Quarantine pests

Organisms (e.g. insects, mites, nematodes, phytoplasms, bacteria, fungi, viruses and viroids), classified as quarantine pests can potentially be harmful in an area where they are not yet present. After introduction, they also can be classified as quarantine pest when their presence is limited and official surveys and control measures are applied. They threaten single plant species or the biological diversity as a whole. The Institute has a broad expert knowledge in obtaining reliable data. On the one hand this is required for the policy advising and on the other hand for the justification of phytosanitary measures in consistence with international standards. The phytosanitary risks of quarantine pests in Germany are almost exclusively evaluated by the Institute.


A manifold of information on e.g.diagnosis, biology and effective countermeasures is necessary to prepare phytosanitary regulations against the introduction and spread of plant pests. Normally, this information is not available when a new plant pest occurs and often prompt fundamental scientific work is required.

Our Institute has research expertise on quarantine bacteriology, entomology, mycology and nematology, invasive plants as well as forestal quarantine pests. Our experts must promptly and flexibly react on current problems to establish a scientific basis for the further approach. For example, data for risk analyses are ascertained. Detection or treatment measures are optimized or impacts of the climate change on phytosanitary problems are evaluated. Furthermore the Institute coordinates surveys on the spread of quarantine pests in Germany. The prevention of the spread of quarantine pests is for Germany and the European neighbouring countries and even globally of great importance. That is the reason for our research cooperation in the European Union in the EUPHRESCO-Network. Through this international networking the available research resources can be organised and utilized more efficiently.

Risk analyses

According to the Plant Protection Law, the JKI is the German responsible authority for the conduction of risk analyses. Thus the Institute evaluates whether a new plant pest represents a significant threat to Germany or Europe. The conduction of an analysis is based on international standards. We evaluate the expected economic and ecological damage for each organism in question by considering the commodity flow and the potential for the establishment as well as the spread. On the basis of this analysis it is determined whether eradication or control measures against the organism are justified. When new plant pests are detected during import controls, we conduct a risk analysis within a few days and decide on the necessity and the manner of the countermeasures. On the one hand this short-term working is necessary to prevent non-justified trade obstructions and on the other hand to prohibit the import of harmful plant pests at an early stage. The result of our risk analyses and further information on plant pests and their occurrence is published in the Portal Plant Health.