砧木是果树生产的基础,它对果树树体大小、结果早晚、产量高低、品质好坏、适应能力和抗逆性强弱,都有一定的影响。因此,发展果树生产,必须根据各地的自然条件,选择适宜的砧木种类。云南地处我国西南边疆,位于北纬21°9—29°15’,东经97°39’—106°12’之间。属低纬高原,全省地势西北高,东南低,地形地势错综复杂,山峦起伏,河川下切,高差悬殊较大。气候类型多样复杂,有北热带、南亚热带、中亚热带、北亚热 Rootstock is the basis of fruit tree production, and it has a certain impact on the size of fruit tree, the results of early and late, yield level, quality, adaptability and resistance strength. Therefore, the development of fruit tree production, according to the natural conditions of various places, choose the appropriate stock of rootstocks. Yunnan is located in the southwest border of our country, located between latitude 21 ° 9-29 ° 15 ’and longitude 97 ° 39’-106 ° 12’. Is a low latitude plateau, the province’s terrain northwest high, low southeast, terrain is intricate, undulating hills, river cutting, great disparity. Climatic types are diverse and complex, with North, South, Central Asia and North Asia