Ensure that fruitlets set with adequate numbers of seeds Optimise crop loading by judicious thinning of flowers and/or fruitlets Climatic conditions in the first month after fruit set Prune and train trees so as to optimise exposure of fruits to light and achieve good colour development Maintain adequate and balanced tree nutrition and water supply Avoid use of crop protection or other chemical sprays which may cause damage to the skin of fruitlets (russeting) Apply gibberellin sprays to improve final skin finish of fruits The physiology of fruitlet growth Photosynthesis and carbon supply to the fruitlets Production and movement within the tree of natural plant hormones