Le plant français de pomme de terre FNPPPT Gnis

Classification of harmful organisms

- Quality-regulated harmful organisms
- Quarantine-regulated organisms
- Other organisms

Quality-regulated harmful organisms

A crop and/or batch tolerance is accepted for these harmful organisms. These organisms are subject to official inspection in accordance with the application of the appendix to the technical regulations for production, control and certification.

The following list gives those quality-regulated organisms that are mentioned in the appendix to the technical regulations:

• On crops :

- Black leg: Erwinia carotovora subsp. atroseptica;
- Virus causing slight or serious distortion of the leaves;
- Verticilium wilt: Verticillium sp.;
- Black scurf: Rhizoctonia solani.

• On batches :

Unspecified organisms, causing:

- Fusarium: Gangrene, Fusarium, and Late blight;
- Wet rot: Erwinia;
- Surface necrosis of viral origin: particularly the YNTN virus.

Organisms causing tuber surface disease:

- Common scab: Streptomyces scabies and Streptomyces sp.;
- Black scurf: Rhizoctonia solani;
- Powdery scab: Spongospora subterranea;
- Wireworms: Agriotes sp.

Quarantine-regulated organisms

No crop and/or batch tolerance is accepted for these organisms. They come directly under the directive on plant health 77/93/CEE. Checking for these diseases is organised according to the technical regulations on production, control and certification, as well as ?framework agreements from the Ministry of Agriculture (DGA - General Food Directorate) and the GNIS (French National Interprofessional Grouping for Seeds). These regulations concern the issuing of plant health passports and plant health certificates.

The following list gives the quarantine organisms mentioned in the appendix to the technical regulations on production, control and certification:

• On crops :

- Potato wart disease: Synchytrium endobioticum;
- Ring rot: Clavibacter michiganensis sp. sepedonicus;
- Black rot: Ralstonia solanacearum;
- Mycoplasma: Stolbur;
- Tomato spotted wilt virus: TSWV Virus or Tomato spotted wilt virus;
- Potato rot nematodes: Ditylenchus destructor;
- Potato cyst nematodes: Globodera pallida and Globodera rostochiensis.

• On batches* :

- Potato wart disease: Synchytrium endobioticum;
- Brown rot: Ralstonia solanacearum;
- Ring rot: Clavibacter michiganensis sp. sepedonicus;
- Mycoplasma: Stolbur;
- Root knot nematode: Meloïdogyne chitwoodi and fallax;
- Potato cyst nematodes: Globodera pallida et Globodera rostochiensis;
- Tomato spotted wilt virus: TSWV virus Tomato spotted wilt virus;
- Potato beetle: Leptinotarsa decemlineata;
- Tuber moth: Phthorimaea operculella.

* In the case of suspicious symptoms corresponding to those caused by the quarantine organisms mentioned above, samples are taken for laboratory analysis and identification.

Other organisms

The presence of quality-regulated organisms other than those mentioned above is only indirectly taken into account, not directly. We may give the following examples:

- The rejection or reclassification of a propagation plot due to a poor-quality crop caused by attacks of late blight, early blight or insects (section 4.8 of the appendix to the technical regulations).

- Rejection of a batch due to alteration in germination caused by the development of silver scurf on the tuber eyes.




Un site dédié au diagnostic des altérations superficielles

Le GNIS a ouvert en juillet 2014 un site internet pour le diagnostic des altérations superficielles des tubercules de pomme de terre. Gratuit, cet outil collaboratif propose une classification des altérations superficielles selon des critères visuels de reconnaissance. Il permet d'identifier les causes connues ou potentielles et de repérer les confusions possibles. Selon la problématique, l'entrée peut se faire sur une base photographique ou bien par la cause potentielle (pathogène, ravageur ou facteur abiotique).

Présenté dans sa version anglaise lors du 19 ème Congrès EAPR en 2014, le site devrait être proposé en français en 2015.

www.potato-tuber-blemishes.com