【Objective】Avocado(Persea americana Mill.) is an important evergreen fruit crop grown in several countries with tropical and subtropical climates. Total world production was more than 4 million tons in 2011, with 70% of the production coming from countries including Mexico, Chile, Dominican Republic, Indonesia, Colombia, Peru, USA and Guatemala. Avocado was introduced to China at the beginning of 20 thcentury, and is now widely planted in provinces in south China, such as Hainan, Guangxi,Guangdong, Guizhou ...