随着冀北错季蔬菜的发展,大白菜成为坝上高寒区种植面积最大的蔬菜,到2005年种植面积已达到20万亩,占坝上蔬菜种植面积的1/3。但由于常年连作,大白菜病害发生较严重。经过几年田间调查,总结出影响冀北坝上大白 With the development of wrong-season vegetables in northern Hebei, Chinese cabbage has become the largest planted vegetable in the barbaric alpine region. By 2005, the planted area has reached 200,000 mu, accounting for one-third of the area planted with vegetables on the dam. However, due to perennial cropping, cabbage disease occurred more serious. After several years of field investigation, summed up the impact of Hebei Daba pale