Sweetpotato production in Tanzania is below the country’s potential due to limited availability of clean planting material during the planting season, usually at the onset of rains. Farmers mostly depend on materials conserved from the previous season whose quality is often unknown. This contributes to spread of Sweet potato virus disease (SPVD) and weevils – the two most important constraints in production. A decentralized seed system with reliable linkages between research institutions or private tissue culture laboratories and farmer multipliers can help circumvent this problem. However, there is need for a quality assurance system which will ensure that materials at each step in the seed value chain meet acceptable standards. This poster demonstrates that QDS standards are practical and can be implemented by farmer multipliers. By use of insect-proof net tunnels, adherence to good agronomic practices such as rotations and isolation distances,  multipliers have managed to keep sweetpotato viruses in check.