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Summary of the Express Pest Risk Analysis for Phytophthora chrysanthemi


Phytophthora chrysanthemi is pathogen of plants of genus Chrysanthemum. From 1998 (Naher et. al. 2011) to 2017 P. chrysanthemi was detected in 4 countries (Tomiċ and  Iviċ 2015, Götz et. al 2017).

Phytophthora chrysanthemi also appears in Germany, which are second only to Netherlands in production of plant material for cultivation and export.

Rating of the likelihood of impact without phytosanitary measures: High

Greenhouses crops are at particular risk due to sufficient (high temperature) conditions.

Rating of the likelihood of damage in open air cultivation: Low

Potential risk of losses caused by pathogen is low because of climatic conditions in PRA area at the moment. The assessment should be repeated in case of climatic changes.

Additionally, the similarity of symptoms between infections caused by Phytophthora chrysanthemi and other Phytophthora species can cause numerous misidentifications.

Rating of the likelihood of entry: moderate

Rating of the likelihood of establishment: high (for crops in protected conditions)

Rating of the likelihood of spread: low

Pest may spread in field crops and gardens in case of climatic changes in PRA area.

Control of imported material from area of pest occurence is a basic phytosanitary measure.


  • Phytophthora chrysanthemi


  • Chrysanthemum


Type File Size
Pest Risk Analysis Download 386,75kB

PRA Area

  • Poland