Further Evidence on the Necessity of Boron for Health in Citrus

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Abstract
Further studies confirmed the results previously obtained. When citrus trees were grown in cultures lacking B, deficiency was marked by corking and splitting of the leaf veins; curling and abscission of leaves; abundant production and premature death of new growth; multiple buds; in extreme cases a splitting of the bark of twigs and trunk followed by exudation of gum, decay of roots, and an accumulation of excessive amounts of carbohydrates in affected leaves; and a degeneration chiefly of the cambium and phloem regions accompanied by production of gum. The early resumption and the rapidity of growth, following the addition of B to cultures previously deficient in this element, may be a consequence of an increased diastatic activity and rapid movement of the large supply of carbohydrates following formation of new conducting tissue.

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