随生产条件和耕作制度改变,白菜最主要的病害已由过去的孤丁病、霜霉病、软腐病增加到孤丁、霜霉、软腐、黑腐、黑斑、角斑六大病害,后期施药对控制白菜病虫显得十分必要。然而,封垄后在外围施药困难,防效不佳,进地施药增加白菜的人为损伤,致使细菌病害加重,结果可能得不偿失。传统的后期防病虫技术亟待改进。留打药行种植,一方面直接减少有效生产面积,降低产量,几行白菜空一行与传统种植方式相违背,似乎不符高产目标,人们似乎难于接受。但另一方 With the production conditions and farming system changes, the most important diseases of Chinese cabbage have been from the past, the disease, downy mildew, soft rot disease to the growth of Solitary Ding, downy mildew, soft rot, black rot, black spot, horn spot six major diseases Post-application of cabbage pest control is very necessary. However, after the closure of the ridge outside the pesticide application difficulties, poor control effect, into the ground to increase the man-made cabbage injury, resulting in increased bacterial disease, the result may be worth the candle. The traditional late pest control technology needs improvement. However, it is difficult for people to accept the fact that the cultivation of drugstores will not be accepted as long as they plan to reduce the effective production area and reduce the output directly. But the other party