Pear trees are multiplied by grafting. There are many kinds of rootstocks that can be used for grafting. They are divided into the following categories: l. Qiuzi pear: With its wild species, the root system is well developed and its cold resistance is strong, so it is appropriate to use it as an rootstock in cold regions. Strong resistance to rot and black spot disease, affinity with pears, and application in warm southern areas are not as good as those of Du Pear. 2, Du Pear (Sao Pear): strong growth, deep roots, fibrous roots, strong adaptability to the soil, drought resistance, waterlogging resistance, alkali resistance and heat resistance are strong, and Chinese pear and pears are strong grafting affinity. Both seedlings and root shoots can be applied in production. The disadvantage is poor resistance to rot, cold resistance is not as good as Qiu Zi pear. 3, bean pear (river pear): the rootstock widely used in the Yangtze River basin and its south area. Hi warm, humid and rainy climate. It is mainly used as rootstock for sand pear production. The affinity with pears is stronger than that of Chinese pears. Deep roots, drought resistance, resistance to turbidity. The initial growth is slower. The resistance to rot was inferior to Qiu Zi Pear, and the cold resistance and alkali resistance was inferior to Du Pear. 4, Ma Pui: distributed in the northwest Shaanxi, Gansu, Ning and other provinces. More cold-resistant, drought-tolerant, strong disease resistance. Due to its strong foraging ability, it is mostly propagated by root larvae, and it is one of the commonly used rootstocks for northwest pears. 5. XXK: There are more distributions in Xinjiang and Shaanxi. The roots are shallow, requiring fertile topsoil and shrubs. 2-3 meters high, can be used as a pear dwarfing anvil. As a result, the fruit is large and of good quality. Widely used in Western Europe and the United States.
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