通过品种来防治某些重要的病害,是病害防治中最经济和有效的基本途径,但是一个新品种的育成和推广,需要一个相当长的时期;同时,由于生产上已习惯于这个或那个品种,要更换一个品种也不是一件容易的事情,所以我们希望一个优良品种能保持一个相当长时期的抗病稳定性,继续发挥它的 The prevention and control of some important diseases through varieties is the most economical and effective way to prevent and control diseases. However, the breeding and promotion of a new variety takes a long time. At the same time, due to the fact that the production has been accustomed to one or the other varieties , To change a species is not an easy task, so we hope that a good variety can maintain a long period of stability, continue to play its