小白菜害虫的发生特点及防治根据系统调查发现，危害小白菜的害虫有１８种，其中主要以蚜虫、菜螟、黄曲条跳甲、菜青虫、猿叶虫发生较重。根据不同播期小白菜的防治结果，４月底以前收获的小白菜一般不用防治；５月底以前收获的只需在５月中旬防治１次；６月份以后需防治... Occurrence characteristics and control of Chinese cabbage pests According to the systematic investigation, 18 kinds of pests that endanger the Chinese cabbage are found. Among them, aphids, Caenorhabditis nigricans, Bemisia tabaci, Beauveria bassiana, Penicillium spp. Occur heavier. According to the different sowing dates of the results of the prevention and treatment of cabbage, harvested cabbage before the end of April generally do not have control; harvest by the end of May just in mid-May prevention and control 1;