梨抗寒新品系７１—４５６梨７１－４５６具有抗寒、质优、适应性广等突出综合性状。该品系具有很大的发展前途。现将其主要表现性状简介如下：一、物候期在我国北方气候条件下．花芽萌动期为４月下旬，初花期５月中旬，盛花期５月下旬，５月初展叶，１０月下旬落叶，果实... Pear new line of cold 71-456 pear 71-456 with cold, high quality, wide adaptability and other prominent comprehensive traits. The line has great development prospects. Now its main performance traits as follows: First, the phenophase in the northern climate conditions in our country. Flower Bud germination period in late April, early flowering in mid-May, full-flowering in late May, early May exhibition leaf, late October leaves, fruit ...