开二次花又叫返花，返花的同时发出很多新叶叫返青。返青返花对梨翌年生长结果极为不利。引起返青和返花的直接原因是早期落叶。据观察，梨树如果在１０月中旬以后落叶，一般不会返青和返花。在培管不善的梨园或春夏雨水特多的年份，有些品种常在８月中旬就大量落叶，８月下旬 Open the second flower is also called back to flowers, flowers at the same time issued a lot of new leaves called green. Returning green flowers on the pear growth results next year is extremely unfavorable. The direct cause of greening and returning flowers is early deciduous leaves. It is observed that if the pear leaves deciduous after mid-October, it will not return green and return flowers. In poorly managed pear or spring and summer rainfall especially many years, some species often large leaf deciduous in mid-August, late August