8.—(1) Subject to sub-paragraph (6), candidate pre-basic mother plants, pre-basic mother plants and pre-basic material must be maintained by the supplier in facilities designated for the genera and species concerned and which are insect proof and ensure freedom from infection through aerial vectors and any other possible sources throughout the production process.
(2) Subject to sub-paragraph (6), candidate pre-basic mother plants must be kept physically isolated from pre-basic mother plants until it is established that they are free from the pests described in paragraph 9(1) and (2).
(3) Pre-basic mother plants and pre-basic material must be—
(a)subject to sub-paragraph (6), grown or produced and isolated from the soil, in pots of soil-free or of sterilised growing media;
(b)identified by labels to ensure their traceability; and
(c)subject to sub-paragraph (6), maintained in a manner which ensures that they are individually identified throughout the production process.
(4) Pre-basic mother plants and pre-basic material may be maintained by cryopreservation.
(5) Pre-basic mother plants may only be used for a period as calculated in accordance with the appropriate EPPO protocol on the basis of—
(a)the stability of the variety;
(b)the environmental conditions under which they are grown; and
(c)any other determinants having an impact on the stability of the variety.
(6) Where a derogation has been granted by the European Commission under Article 8(4) of Commission Implementing Directive 2014/98/EU in relation to the particular genus or species concerned, pre-basic mother plants and pre-basic material may be produced in the field under non-insect proof conditions provided that—
(a)the pre-basic mother plants or pre-basic material concerned are identified by a label ensuring their traceability; and
(b)appropriate measures are taken to prevent infection of the plants by any possible sources, including by—
(i)aerial vectors;
(ii)root contact; and
(iii)cross infection by machinery and grafting tools.