b'ASSOCIATION NEWS Figure 4. Laboratory ratings for 2024 for all tests and all participants onFigure 5. Results of thousand-seed weight (TSW) in the ISTA Proficiency ISTA Proficiency Test rounds PT23-3 Trifolium hybridum, PT24-1 TriticumTest round PT23-3 Trifolium hybridumaestivum subsp. aestivum and PT24-2 Matthiola longipetala: comparison between accredited laboratories and those participating voluntarilyTable 3. Means and standard deviation of the accredited participants (for whom ISTA Proficiencylaboratories (replicates or counting of complete Testing is obligatory) sample). Samples for this test were dispatched in non-waterproof containers, and this did not have Mean values (g) Standard deviation any influence on the TSW results (Figs 4 and 5).Lot 1 Lot 2 Lot 3 Lot 1 Lot 2 Lot 3 Future Proficiency Test 0.773 0.782 0.782 0.02 0.06 0.01 Committee PlansThe PTC is preparing the PT Programme Plan Table 4. Overview of methods used by participants for 20262028 which will be posted on the ISTA website (see www.seedtest.org/en/technical-Number of users committees/proficiency-test-committee.Method Total number of users html), and a specific webinar was organised AccreditedVoluntary on this topic on 30 June 2025 (go to youtu.be/laboratories participants PaSyCsLCgWQ?si=dlmxfLxgFNssdkBm). During Counting replicates 62 54 116 the webinar the principles of and handling of the Counting whole pure14 8 22 PT Programme Plan were explained, particularly seed fraction the increasing legislative phytosanitary requirements of the recipient countries. The importance of checking those requirements when engaging with the PT Programme Plan is essential for the successful receipt of the samples. Safe receipt of the samples is the responsibility of the PT participants. Therefore, any information about requirements must be communicated to the ISTA Secretariat in a timely manner.SEED TESTING INTERNATIONAL OCTOBER 2025 61'