Seeds of cowpea and common bean produced, in Paraíba State, Brazil, were treated with chemicals fungicide captan and the insecticide malathion and with natural products (oil of Elaeis guanensis L.) and extract of Astronjum urundeuva Engl.). After the treatment, the seeds were accondicionated in metal and cotton packages and maintained in storage under natural condition during nine months. The analysis, moisture content, germination, speed germination index and micoflora, before treatment and storage, determinated the seed as elevated quality. During storage were found statistical significative e differences for products package, storage periods and interaction of these factors. The fungal occurrence was associated to the seeds moisture content. Besides, in the metal package, seeds presented the highest values of germination and vigour, and lesser fungal incidence than the seeds maintained in cotton package. The chemical fungicide captan when mixed with the natural products proportionated the best performance of the seeds.