利用抗病品种是防治稻瘟病最经济有效的一项措施。但抗病品种种植若干年后往往丧失抗性,这是抗病育种和良种推广利用中急需研究解决的问题,以往本省曾有过品种抗性丧失的事例,近几年来,晚稻抗病品种双糯4号在部分地区逐渐趋向感病,有的地 The use of disease-resistant varieties is the most economical and effective measure to control rice blast. However, the resistance cultivars often lose their resistance after being planted for several years. This is an urgent need to study and solve the problems of disease-resistant breeding and the promotion and utilization of improved varieties. In the past, there were cases of resistance loss in the province. In recent years, Glory 4 in some areas gradually tend to be susceptible, and some