果树生理落果的预防果树在生长发育过程中，由于非机械外力和病虫危害的作用而造成的大量落果称为生理落果。据观察：苹果、梨、桃、葡萄等果树的生理落果有二次，一次在落花后２周，果实迅速膨大初步发育成幼果时；第二次出现在第一次落果后的２—４周，通常称为“六月落... Fruit tree physiological drop fruit tree growth and development process, due to non-mechanical external forces and pest damage caused by the role of a large number of fruit fall is called physiological drop fruit. It is observed that the physiological fruit drop of apple, pear, peach, grape and other fruit trees is secondary, once in 2 weeks after the flower fall, the fruit rapidly expands and initially develops into young fruit; the second time appears after the first drop of fruit 2-4 Week, commonly known as "June Fall ...