EPPO Platform
on PRAs

Rapid assessment of the need for a detailed Pest Risk Analysis for Trichodorus cedarus Yokoo


Summary and conclusion of rapid assessment

Likelihood of entry is: moderately likely with moderate uncertainty. There have only been four interceptions in the UK. However it may have previously avoided detection.
Likelihood of establishment is: moderately likely outdoor and likely in protected conditions.
Economic impact is expected to be: moderate with high uncertainty. However the biology of this species has not been studied, consequently its virus-vector capability and potential economic impact in the UK is unknown.
Endangered area: ornamentals grown in protected conditions.
Risk management: Options available for interceptions include destruction; re-export; and thorough root washing and repotting in sterile growing media, with the collection and treatment of washings. Granular treatments (e.g. oxymyl) are available for pest management in protected ornamentals.


  • Trichodorus cedarus


  • Abies homolepis
  • Abies sachalinensis
  • Carpinus tschonoskii
  • Chamaecyparis obtusa
  • Cryptomeria japonica
  • Ilex crenata
  • Larix kaempferi
  • Picea jezoensis subsp. hondoensis
  • Pinus
  • Pinus parviflora
  • Quercus acutissima
  • Torreya nucifera


Type File Size
Pest Risk Analysis Download 257,75kB

PRA Area

  • United Kingdom