Regulated non-quarantine pest Project

An EU funded project for the benefit of the whole EPPO region



Name as submitted in the project specification (if different to the preferred name):
Pythium spp.

Pest category:

1- Identity of the pest/Level of taxonomic listing:

Is the organism clearly a single taxonomic entity and can it be adequately distinguished from other entities of the same rank?

Is the pest defined at the species level or lower?:

Can listing of the pest at a taxonomic level higher than species be supported by scientific reasons or can species be identified within the taxonomic rank which are the (main) pests of concern?
  • No: Ornamental sector
Is it justified that the pest is listed at a taxonomic rank below species level?
Not relevant

  • Not candidate: Ornamental sector
Justification (if necessary):
For the Seed potato Sector, experts indicated that Pythium ultimum is mostly encountered. However experts concluded that more investigations and efforts to diagnose pest at the species level is needed. This would be necessary for a listing at the Species level. As long as measures are only based on symptoms for this pest, a listing at the Genus level is appropriate for this sector.
For the Vegetable reproductive and planting material (excluding seeds) Sector, and for the Ornamental sector, no EU Member State identified this entry as important and justified to keep Pythium listed at a higher level than the species level. No EU Member State proposed to replace this entry by pests listed at the Species level.
[identification by France was an error]

HOST PLANT N°1: Pelargonium (1PELG) for the Ornamental sector.

Origin of the listing:
Commission Directive 93/49/EEC

Plants for planting:
Plants intended for planting

Disqualified: No EU Member State considered this entry as important in the answers to the RNQP Questionnaire [identification by FR was an error] and gave justification(s) for a listing at a higher level than the species level. This entry will be covered by the 'substantially free from' requirement that will remain in the ornamental EU Marketing Directives.

8 - Tolerance level:

Is there a need to change the Tolerance level:

Proposed Tolerance levels:

9 - Risk management measures:

Is there a need to change the Risk management measure:

Proposed Risk management measure:

  • EPPO (1998) PP 2/13 (1) Good plant protection practice. Ornamental Plants under Protected Cultivation. Bulletin OEPP/EPPO Bulletin 28, 363–386;
  • Gravel V, Ménard C & Dorais M (2009) Pythium root rot and growth responses of organically grown geranium plants to beneficial microorganisms. HortScience 44, 1622-1627;
  • Kelling K (1985) Pythium species causing rot diseases in ornamentals. Nachrichtenblatt für den Pflanzenschutz in der DDR 39, 191-193;