桃树生理落果一般发生在落花后3～15天,先落者多是授粉受精不良者,后落者是因此时树体储备营养已经消耗尽,而新发叶片数量不足,处于幼嫩状态,光合产物不足,有机营养少,供不上幼果发育的需求,造成大量落果。 Physiological deciduous peach tree usually occurs after 3 to 15 days after falling, the first person who is pollination and poor fertilization are poor, who fall is so when the tree reserves have depleted nutrients, and the new leaves lack of number in a young state, Lack of photosynthetic products, organic nutrition, for the development of young fruit on the demand, resulting in a large number of fruit drop.