VIRUS, ROOTSTOCK AND STRAIN EFFECTS ON THE LEAF NUTRIENT LEVELS OF McINTOSH APPLE TREES

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Abstract
Major nutrient levels of leaves from two strains of virus-inoculated and uninoculated McIntosh apple trees on 10 rootstocks were compared from the 8th to the 12th year. Virus inoculation resulted in reduced leaf levels of N, P, K and Ca. Rootstock affected N, P, K, Mg and Ca some years, but only with K, Mg and Ca was the effect consistent over the 5 yr tested. The strain of McIntosh affected the Ca levels some years. Differences in leaf nutrient levels between years were highly significant. Interactions between year, virus and rootstock are discussed.Key words: Malus domestica, leaf nutrient levels, virus effects, Ottawa rootstocks

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