Originating in Central Asia, apples are one of the most important fruits globally and are grown in over 100 countries. Apple cultivation faces a number of challenges. Increasing global competition has put the focus on lowering costs whilst further improving sensory quality and shelf-life. There is a need to reduce inputs such as water, fertiliser and labour, both to save costs and reduce environmentally-damaging emissions and pollution. There is a continual battle with fungal, viral and bacterial diseases as well as insect pests. In the long term there is a need for new varieties able to...