Parthenocarpy refers to some peach varieties (such as Feicheng Peach, Shenzhou Peach, Fengbai, Annong Shuimi, Mayxian, Junbai and sand introduced from Japan, etc.). Some flowers that have not been pollinated and fertilized can also set fruit and grow to maturity. This phenomenon is called parthenocarpy (commonly known as peach slave). Parthenocarpic fruit is small, with seed coat, no embryo or small embryo (abortion), and the fruit matures late and tastes sweet. But it can't be used as a normal commodity fruit. According to the investigation in Shenxian County, under natural conditions, the parthenocarpy of Shenzhou Peach is 30% ~ 40% every year, and the parthenocarpy of Feicheng Peach accounts for about 50%, sometimes 20%, which has different degrees of influence on the yield and quality. Therefore, reducing the proportion of peach slaves is one of the main measures to realize efficient cultivation of these peach varieties.

According to the investigation of Shandong Feicheng Garden, the parthenocarpy of Feicheng peach is more on the flourishing branches of flourishing trees, and there are many years of freezing injury. According to Zeng Mian's investigation, there are many parthenocarps on old trees and weak trees, and there are many flowers that bloom late, and many are young and young. 1967 The artificial pollination of Feicheng peach and Shenzhou peach in Shenxian county, Hebei province decreased parthenocarpy by 48.5% compared with that without artificial pollination. The exact reason why these varieties are easy to produce parthenocarpy is unclear, which may be related to the characteristics of low self-pollination or infertility, poor flower bud quality and poor pollination and fertilization conditions. Julia child (1975) once concluded that there are three reasons why peaches form parthenocarpy. First, the flowering period was frozen, which injured the ovary; Secondly, some self-fertile varieties are easy to produce parthenocarpy; The third is the role of gibberellin.

At present, the following technical measures are mainly taken in production to reduce the occurrence of parthenocarpy. ① Strengthen the management of trees in the previous year, increase the backflow of nutrients in trees, and improve the differentiation of flower buds. ② Implement anti-freezing technical measures at flowering stage (smoke when frost occurs; Irrigation before flowering, delaying flowering period, etc.) (3) Do a good job in artificial pollination, improve pollination fertilization rate and fruit setting rate. (4) After distinguishing the peach slave from the normal fruit, timely remove the peach slave.