Development of potato planting material production and multiplication systems outside the closed zones in Romania.

The success in big and continuous potato production resides in producing healthy planting material with high biological value in quantities covering the needs. Reaching this goal is difficult because of the continuous and progressive infection rates of potato plants with virus diseases causing degeneration and regression of production. In this respect, alongside the organization of closed areas for seed potato production in Romania, there is a need for zones outside the closed areas in order to provide the entire quantity of seed potatoes in our country and also in order to provide a system to renew seed potatoes.