Abstract
Abstract Levels of several inorganic elements were determined at one time in samples of trunk phloem from 3 adjacent pairs of healthy and blight-affected ‘Marsh Seedless’ grapefruit (2 groves) and ‘Pineapple’ orange (1 grove) trees on rough lemon rootstock. A smaller number of elements were determined seasonally over a 1½-year period in the trunk phloem from 3 similar pairs of healthy and declining trees per grove. Zn, Mn, and N levels in the trunk phloem of blighted trees were significantly higher than in healthy trees, and B levels were significantly lower in the one-time sample analysis for Zn, Mn, Cu, K, Na, Mo, B, Cl, and N. Zn and Mn levels were significantly increased in blighted trees for all samples during the seasonal analysis for Zn, Mn, Cu, K, and Na. Cu and K levels were significantly higher in blighted trees only on some sampling dates. Zn levels continued to increase with time in blighted trees. None of the other elements showed a consistent pattern of change with time. In a study of 5 elements in north- vs. south-side trunk phloem, only Zn in healthy trees was different consistently in each side of the tree.
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