Pierce's disease of grapevine
younger vines than in older ones and faster in susceptible cultivars (within 2-3 years) than in more tolerant cultivars, which may survive more than five years [...] shorter internodes. The foliage is denser and the leaves are a darker green than usual. Also, young infected trees show dwarfing. Leaves and flowers appear [...] zinc deficiency. Infection becomes systemic more rapidly in young trees than in older trees. In the latter, it may stay limited to certain branches. When