The sweet cherry is one of the most popular of temperate fruit crops with consumers and is grown commercially in more than 40 countries of the world, in temperate, Mediterranean, subtropical and arid regions of all continents. The sour cherry is cultivated in fewer countries, mainly in Europe and the USA, and is used mainly in processed cherry products. Until recently, horticultural improvement of cherries as a commercial crop has been slow, and major production problems such as bird damage, rain-induced cracking, and bacterial diseases, have remained.

However, in the last 25...