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导言大白菜(Brassica pckinensis Rapr)为我国北方的重要秋菜。近年来由于毒病、霜霉和软腐病等三大病害的发生,年产量很不稳定,给产销方面带来不少困难。从而尽速解决三大病害,以保产增产的问题,就成为大白菜生产上和科学研究上的中心任务。建国以来,广大菜农和有关科技人员在党的领导下,创造出不少防治三大病害的理论和经论,但由于问题比较复杂,因之三大病害的根本消灭,还需有关方面进一步努力。
Introduction Chinese cabbage (Brassica pckinensis Rapr) is an important autumn vegetable in northern China. In recent years, due to the occurrence of three major diseases such as poison, downy mildew and soft rot, the annual output is very unstable, which brings many difficulties to the production and sales. So as to solve the three major diseases as soon as possible to protect the yield increase, it has become the center of cabbage production and scientific research. Since the founding of the People’s Republic, a large number of vegetable farmers and related scientific and technological personnel, under the leadership of the party, have created many theoretical and essays on the prevention and control of the three major diseases. However, due to the complicated problems and the eradication of the three major diseases, further efforts are needed .