Sensitivity of some lettuce cultivars and hybrids to cucumber mosaic virus

agentes nocivos agronomic characters biological control breeding breeding aims campanulatae compositae crops cultivar cultivars cultivos dicotiledoneas dicotyledons disease prevention disease resistance diseases economic plants facteur nuisible formas de descendencia forme de descendance green vegetables hortalizas (plantas) hortalizas verdes hybride hybrids injurious factors inoculation lactuca lactuca sativa lutte biologique methode methods objetivo de mejoramiento pest control methods plantas plante plante de culture plants progeny forms resistance to injurious factors resistencia a la enfermedad symptome symptoms vegetable crops virose viroses virosis