L 185/36
4.
EN
Official Journal of the European Union
12.7.2022
SAMPLE PREPARATION
4.1.
Samples from asymptomatic tubers The standard sample shall contain 200 tubers per test.
The appropriate laboratory procedure to process the heel end cores to obtain the extract for detection of the specified pest is described in international diagnostic standards. 4.2.
Samples from asymptomatic specified plants Detection of latent infections shall be carried out on composite samples of stem segments or leaf petioles.
The procedure may be applied for up to 200 stem parts or 200 leaf petioles from different plants in one sample.
The appropriate laboratory procedure to disinfect and process the stem or leaf petiole segments to obtain the extract for the detection of the specified pest is described in international diagnostic standards. 4.3.
Samples from symptomatic material of the specified plants Sections of tissue shall be aseptically removed from the vascular ring in a potato tuber or from the vascular strands in stems of specified plants showing wilting symptoms.
The appropriate laboratory procedure to process these tissues to obtain the extract for the detection of the specified pest is described in full detail in international diagnostic standards. 4.4.
Samples of surface or recirculation water (including potato processing or sewage effluents) The principal test for the detection of the specified pest in samples of surface water, water from recirculation systems and effluent samples (potato processing industry) is selective isolation.
The appropriate laboratory procedure to process water samples is described in international diagnostic standards.