Portaria n. 1137/91 de 05/11/1991. Aprova o Regulamento da Produção, Certificação e Comercialização de Materiais de Viveiro Vitícolas, Diário da republica I Serie B n. 254 de 05/11/1991 Página 5639

This regulation establishes the rules for the production, certification, and marketing of grapevine planting material in Portugal. It aims to ensure the quality and traceability of materials used for vineyards. This affects grape growers, nurseries, and certification bodies. It ensures that only certified and high-quality grapevine material is used in commercial plantations.