Cracking of the fruit.
Made worse by
Acidic soils. Sandy or light soils (leaching). Acid peat soils. Soils rich in sodium. Soils rich in aluminium. Drought conditions. Fruit high in nitrogen or potassium. Large fruit.
Leaves are properly formed and remain throughout cycle. Overall tree growth is more vigorous. Yield often increases. Fruit-size more regular and uniform. Better quality fruit. Better skins - less 'Albedo Breakdown' (creasing).