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Scientific Opinion on the phytosanitary risk associated with some coniferous species and genera for the spread of pine wood nematode


The European Commission requested the Panel on Plant Health to deliver a scientific opinion on the phytosanitary risk of plants (other than fruits and seeds) of Pinus pinea and of the genera ChamaecyparisCryptomeria and Juniperus for the spread of pine wood nematode (PWN) via movement of infested plants or untreated plant products or by supporting natural spread of PWN in conjunction with European species of the vector. The Panel analysed the data submitted by Portugal regarding surveys on the Tróia Peninsula where P. pinaster and Ppineaco-occur, and the related laboratory results of Naves et al. (2006) on feeding and oviposition preferences of Monochamus galloprovincialis. The Panel also undertook a comprehensive review of the literature. The zero infestation of PWN recorded on Ppinea on the Tróia Peninsula was not significantly different from the result for Ppinaster, because of the small Ppinea sample. Hence, the conclusion that Ppinea is not a host plant for PWN is not supported by the data submitted, principally because of low statistical confidence arising from the few P. pinea trees present. Moreover, the limited presence of Ppinea in the study areas means that the results are representative neither of the Tróia Peninsula nor of other parts of Portugal. Naves et al. (2006) recorded some oviposition by Mgalloprovincialis on P. pinea, but less than on other hosts. No differences in feeding of Mgalloprovincialis on Ppinaster and Ppinea were detected, thus potentially allowing PWN transmission to trees by this route. The available information regarding the genera ChamaecyparisCryptomeria and Juniperus as potential hosts of Monochamus spp. and PWN suggests overall a low susceptibility to PWN or its vectors; the uncertainty concerning PWN is high and would require supplementary research.


  • Bursaphelenchus xylophilus
  • Monochamus
  • Monochamus galloprovincialis


  • Chamaecyparis
  • Cryptomeria
  • Juniperus
  • Pinus
  • Pinus pinaster
  • Pinus pinea


Type File Size
Pest Risk Analysis Link to file

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