Cucurbit Genetics Cooperative Report 21:62-62 (article 22) 1998 Humberto Rios Labrada, Yunaima Perera Ibarra y Antonio Fernandez Almirall Instituto Nacional de Ciencias Agricolas (INCA). GP no1 San Jose de las Lajas, La Habana, Cuba cp 32700 Introduction. The “informal seed sector” describes the ability of farmers – rather than breeders – to maintain, develop, enhance, […]