一、大白菜提纯复壮的重要意义我市青麻叶大白菜是一种优质、高产、耐贮、适应性强的优良秋菜品种,不但是我市主要秋菜,并已推广到很多省、市,如山东、新疆、内蒙、石家庄、吉林等地引种面积逐年扩大。我市每年生产的白菜除供应本市冬春食用外,还有外调出口任务,同时每年还要支援兄弟省、市和出口大量种子,所以我市青麻叶大白菜无论在本市和外地的秋菜生产上均占很重要的地位。但是近年来,由于“四人帮”的干扰,选种工作不被重视,以致品种混杂退化,抗病性降低,病害日趋严重,产量不稳,病害流行年份严重减产,不能充分满足市场需要, First, the important significance of purification and rejuvenation of Chinese cabbage Green Ma leaves of Chinese cabbage is a high quality, high yield, storability, adaptability and good varieties of autumn vegetables, not only the city’s main autumn vegetables, and has been extended to many provinces, Such as Shandong, Xinjiang, Inner Mongolia, Shijiazhuang, Jilin introduced area expanded year by year. In addition to supplying the city’s winter and spring edible, the cabbage produced in our city annually has the task of expatriate export. At the same time, it also supports the provinces, cities and export of large quantities of seeds each year. Therefore, Autumn vegetables production both occupy a very important position. However, in recent years, due to the interference of the “gang of four”, the selection work has not been taken seriously. As a result, the hybrids have been degraded, the disease resistance has been deteriorated, the diseases have become increasingly serious, the output has been unstable, the disease epidemic has been seriously reduced, and the market needs can not be fully met.