Abstract
ABSTRACTClonal selection with associated clinical tests and based on stem cuttings as the initial propagative material has been successfully adopted as a method of producing nuclear stocks of potato varieties free from certain important viruses, fungi and bacteria. The maintenance of health of such nuclear material during the subsequent period of multiplication to commercial quantities, however, has emphasized that gaps in our knowledge of the epidemiology of the diseases caused by these organisms exist and require investigation, so that clonal selection programs can make a maximum contribution to crop improvement.La sélection clonale assortie de tests cliniques, basés sur le bouturage par prélèvement sur tiges pour le matériel initial de reproduction, a été adoptée avec succès pour la production de stocks nucléaires de variétés de pommes de terre indemnes de certains virus, champignons et battéries importants. Les difficultés rencontrées dans le maintien d'une qualité sanitaire élevée de ce matériel nucléaire, pendant la phase de multiplication précédant la commercialisation, ont révélé les lacunes qui subsistent dans la connaissance épidémiologique des différents organismes pathogènes en cause.
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