How to avoid apple sunscald/sunburn

Sunscald or sunburn in apples accounts for yellow or flushed areas on the fruit skin due to direct sun damage often following a period of cooler, cloudy weather. It is often associated with poor calcium content in the fruit. A balanced crop nutrition can help avoid sunburns. In severe instances, the scald damage turns dark while the fruit is still on the tree, with the underlying tissue becoming spongy.

Potassium reduces incidence of sunburn

Potassium and apple Sunscald

A higher concentration of potassium in apples reduces the incidence of sunburn/sunscald. However, potassium needs to be in balance with calcium, as these two nutrients compete with each other and can lead to poor calcium content in fruits, resulting in storage problems and other disorders related to calcium deficiency.

Calcium makes cells less liable to damage

Calcium and Sunscald

By improving calcium content in the skin and pulp, cells are less liable to damage and subsequent breakdown, thereby avoiding sunscald damage in apples.

Recommended fertilisers for apples

Apple fertiliser and crop nutrition advice
Apple fertiliser and crop nutrition advice

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