Rules on marketing of seed and plant material prescribe technical and phytosanitary requirements for individual species of agricultural plants concerning production, preparation for market and marketing of their propagation material and types of surveillance performed by the official certification organ that functions in frame of the official certification. The official certification covers all procedures, i.e. from acceptance of application to field inspection, seed sampling and seed testing (performed by appointed laboratories), making final minutes and issuing official certificates and/or labels - plant passports. Seed and/or plant material lots may be applied for official certification by any national and foreign officially registered producer. Official certification procedures are performed on field crops (cereals, potato, oil plants, fibre plants and fodder plants), vegetables, hop, fruit plants and grapevine.