NAME OF THE ORGANISM: Phytophthora infestans (Wet rot) (PHYTIN)
GENERAL INFORMATION ON THE PEST
Name as submitted in the project specification (if different to the preferred name):
Wet rot
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?
Yes
Is the pest defined at the species level or lower?:
Yes
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?
- Not relevant: Seed potato sector
Is it justified that the pest is listed at a taxonomic rank below species level?
Not relevant
Conclusion:
- Not evaluated: Seed potato sector
2 – Status in the EU:
Is this pest already a quarantine pest for the whole EU?
No
Presence in the EU:
Conclusion:
not evaluated
HOST PLANT N°1: Solanum tuberosum (SOLTU) for the Seed potato sector.
Origin of the listing:
5 - Seed potato sector: Council Directive 2002/56/EC
Plants for planting:
Plants intended for planting, other than [true] seeds
3 - Is the pest already listed in a PM4 standard on the concerned host plant?
Yes
Conclusion:
Qualified
Justification (if necessary):
Pest already listed in the EPPO PM 4 Standard under the dry/wet rot symptoms, but also listed as Blight (Phytophthora infestans) in table 3 of this Standard. Experts indicated that there are other species of Phytophthora for which third countries require the absence (example: Phytophthora cryptogea or P. megasperma) but these pests are very rare on potato compare to P. infestans or P. erythroseptica. Experts concluded that there was a lack of studies to conclude that some other species may cause important economic impacts on potatoes. Experts recommended only listing P. erythroseptica and P. infestans under the wet rot symptoms.
CONCLUSION ON THE STATUS:
Recommended for listing as an RNQP, based on EPPO PM 4 Standard.
8 - Tolerance level:
Is there a need to change the Tolerance level:
No
Proposed Tolerance levels:
9 - Risk management measures:
Is there a need to change the Risk management measure:
No
Proposed Risk management measure:
REFERENCES:
- UNECE (2014) UNECE Standard S-1 concerning the marketing and commercial quality control of Seed Potatoes. UNECE Guide to Seed Potato Diseases, Pests and Defects. Available at http://www.unece.org/tradewelcome/steering-committee-on-trade-capacity-and-standards/tradeagr/brochures-and-publications/potato-diseases-and-pests.html;