Effect of calcium and boron on the incidence of tree and storage pit in apples of the cultivar Egremont Russet

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Abstract
The influence of boron and calcium on tree pit and storage pit was examined in a two-year field trial on Egremont Russet apples in a commercial orchard in Herefordshire. Observations were also made on epidermal cracking of the fruit. Sprays of calcium nitrate reduced tree pit by 47% in the first season and by 57% in the second. In the second season the concentration of calcium in the sound fruits was 30% above control values following treatment with sprays of calcium nitrate, and 46% above control when the same treatment was combined with sprays of boron. Apples with tree pit had lower levels of calcium and magnesium than sound fruits. In the second season storage pit was reduced by 73%, and the degree of pitting by 76%, following sprays of calcium nitrate, and the cracking of fruit was entirely eliminated by sprays containing boron. Sprays of boron increased the content of boron, calcium, potassium and magnesium in sound fruit.

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