All propagative material eligible for entry into the WSDA grape planting stock registration and certification program must be derived from a Generation 1 foundation block held at a National Clean Plant Network (NCPN) supported center and continuously grown under conditions that mitigate the risk of infection. Eligible Generation 1 foundation sources include the Clean Plant Center-Northwest (CPC-NW) at Washington State University and Foundation Plant Services (FPS) at University of California at Davis. The department may approve other grapevine foundation facilities as an eligible G1 foundation source. Such approval shall be in writing. The accession numbers relating to the single (G1) grapevine source must be retained for tracking purposes throughout the life of its certified progeny and provided to the department upon request.