A Note on the Occurrence of Watercore Breakdown in Apples during 1966

SUMMARY The occurrence and appearance of early watercore breakdown in mature ‘Red Miller’ and ‘Miller's Seedling’ apple fruits is described. The incidence of the disorder was positively correlated with the potassium and magnesium status of the fruits and negatively correlated with the calcium content. I am indebted to Dr. J. C. Fidler of the Ditton Laboratory for aid in identifying this disorder and for permission to publish Plate IV; also to Mrs. S. Vinson of East Kent Packers Ltd. for bringing fruit with this disorder to our attention and for obtaining the samples of Red Miller apples.