Symptoms of Calcium Deficiency on Leaves and Fruit of ‘York Imperial’ Apple1

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Abstract
Symptoms of Ca deficiency on the foliage and fruit of ‘York Imperial’ apple trees grown in controlled nutrient cultures are described. Earliest leaf symptoms are chlorosis and upward cupping of youngest leaves followed by marginal necrosis. Fully expanded leaves may develop, on their upper surfaces, chlorotic spots and pustules which later become necrotic. Some leaves may develop almost white margins without necrosis. Earliest fruit symptom is a diffused, golden-amber skin color on exposed surface. Lenticels become prominent, turn brown and develop a brown to black halo. Cracks may radiate from the calyx and, in extreme cases, encircle the fruit which soon drops. Fruit symptoms occur at levels of Ca nutrition above those at which leaf symptoms occur. High N aggravates the development of symptoms on both leaves and fruit.

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