Commission Directive 2008/61/ECShow full title

Section IV: U.K. Plants of stolon- or tuber-forming species of Solanum L. or their hybrids, intended for planting

1. The plant material, as appropriate, shall be subjected to the therapy procedures as laid down in FAO/IPGRI Technical Guidelines. U.K.

2. Each unit of the plant material, following the therapy procedures carried out pursuant to point 1, shall be subjected to indexing procedures. All plant material, including indexing plants, shall be held at the approved facilities under the quarantine containment conditions laid down in Annex I. Plant material intended for approval for official release shall be held under conditions conducive to a normal cycle of vegetative growth and be subjected to visual inspection for signs and symptoms of harmful organisms including all relevant harmful organisms listed in Directive 2000/29/EC and potato yellow vein disease, on arrival and subsequently, at regular intervals until senescence, during the period of the indexing procedures. U.K.

3. The indexing procedures referred to in point 2 shall follow the technical provisions set out in point 5, in order to detect at least the following harmful organisms: U.K.

• Bacteria

  (a)

  Clavibacter michiganensis (Smith) Davis et al. ssp. sepedonicus (Spieckermann et Kotthoff) Davis et al.;

  (b)

  Ralstonia solanacearum (Smith) Yabuuchi et al.

• Viruses and virus-like organisms

  (a)

  Andean potato latent virus,

  (b)

  Potato black ringspot virus,

  (c)

  Potato spindle tuber viroid,

  (d)

  Potato yellowing alfamovirus,

  (e)

  Potato virus T,

  (f)

  Andean potato mottle virus,

  (g)

  Common potato viruses A, M, S, V, X and Y (including Y^o, Yⁿ and Y^c) and potato leaf roll virus.

However, in the case of true seed of potato, the indexing procedures shall be carried out in order to detect at least the viruses and virus-like organisms listed above at (a) to (e).

4. The plant material subjected to the visual inspections referred to in point 2 and on which signs and symptoms of harmful organisms have been observed shall be subjected to an investigation including testing where necessary, to determine, as far as possible, the identity of the harmful organisms causing the signs and symptoms. U.K.

5. The technical provisions referred to in point 3 shall be as follows: U.K.

• Bacteria

  1.

  For tubers, test the heel end of each tuber. The standard sample size shall be 200 tubers. However, the procedure can be applied for samples with less than 200 tubers.

  2.

  For young plants and cuttings, including micro-plants, test the lower sections of the stem and, where appropriate, the roots, for each unit of the plant material.

  3.

  For testing of progeny tubers, or of stem bases for non-tuber forming species, one normal cycle of vegetative growth after the testing referred to in points 1 and 2, is recommended.

  4.

  For the material referred to in point 1, the testing method for Clavibacter michiganensis (Smith) Davis et al. ssp. sepedonicus (Spieckermann et Kotthoff) Davis et al. shall be the Community method set out in Annex I to Council Directive 93/85/EEC(1). For the material referred to in point 2, this testing method could be applied.

  5.

  For the material referred to in point 1, the testing method for Ralstonia solanacearum (Smith) Yabuuchi et al. shall be the test scheme set out in Annex II to Council Directive 98/57/EC(2). For the material referred to in point 2, this testing method could be applied.

• Viruses and virus-like organisms, other than potato spindle tuber viroid

  1.

  The minimum testing for vegetative material (tubers, young plants and cuttings, including micro-plants) shall include a serological test done at or near flowering for each of the specified list of harmful organisms other than potato spindle tuber viroid, and followed by a biological test of material testing negative in the serological test. For Potato leaf roll virus, two serological tests shall be done.

  2.

  The minimum testing for true seed shall be a serological test or a biological test if no serological test is available. Retesting of a proportion of negative samples and testing of borderline results by another method is highly recommended.

  3.

  The serological and biological testing referred to in points 1 and 2 shall be done on glasshouse grown plants, sampled from at least two positions on every stem, including a young fully expanded leaflet at the top of each stem and an older leaflet from a midway position; each stem shall be sampled because of possible non-systemic infection. In the case of the serological testing, no bulking of leaflets from separate plants shall be done, unless the bulking rate has been validated for the method of use; leaflets from each stem may however be bulked to make up the sample from each plant. In the case of the biological testing, the maximum bulking is up to five plants with inoculation of a minimum of duplicate indicator plants.

  4.

  The appropriate indicator plants to be used for the biological testing referred to in points 1 and 2 shall be those listed by the European and Mediterranean Plant Protection Organization (EPPO), or other officially approved indicator plants, which have been shown to detect the viruses.

  5.

  Only material which has been directly tested shall be released from quarantine. Where eye indexing has been done, only the progeny of the tested eye may be released. The tuber should not be released because of possible problems with non-systemic infection.

• Potato spindle tuber viroid

  1.

  For all material, glasshouse grown plants shall be tested, as soon as they are well established but prior to flowering and pollen production. Testing on tuber sprouts/in vitro plants/small seedlings shall only be regarded as a preliminary test.

  2.

  Samples shall be taken from a fully expanded leaflet at the top of each stem of the plant.

  3.

  All material for testing shall be grown at temperatures not less than 18 °C (preferably at temperatures higher than 20 °C) and with at least a 16-hour photo-period.

  4.

  Testing shall be by radioactive or non-radioactive labelled cDNA or RNA-probes, return-PAGE (with silver staining) or RT-PCR.

  5.

  The maximum bulking rate for probes and return-PAGE is 5. Use of this or higher bulking rates must be validated.

(1)

OJ L 259, 18.10.1993, p. 1. Directive as amended by Commission Directive 2006/56/EC (OJ L 182, 4.7.2006, p. 1).

(2)

OJ L 235, 21.8.1998, p. 1. Directive as amended by Commission Directive 2006/63/EC (OJ L 206, 27.7.2006, p. 36).