2. The effective temperature for fruit growth is 18-35℃, the suitable temperature for shoot growth is 24-29℃, and the daily average temperature for fruit setting and young fruit growth should be greater than 20℃. Insufficient temperature, poor pollination and fertilization, and even inflorescence death or embryo abortion death. It is difficult to reach this temperature environment in the north, even if it is planted in greenhouse, it is difficult to manage, so at least the known varieties cannot be planted at present.