杂交水稻汕优6号是我省连作晚稻上的主要当家品种之一,在我区种植面积较大,一般在百万亩以上,约占晚稻总面积的60％左右。该品种自七十年代中后期大面积推广种植以来,表现出抗病高产,对提高晚稻产量起到了重要的作用。但近几年来我区不少地方反映,汕优6号对稻瘟病的抗性下降,发病渐趋普遍,且局部地区相当严重。此种 Hybrid rice Shanyou 6 is the continuous cropland late rice on the main one of the varieties, in our area planted a larger area, generally more than one million mu, accounting for about 60% of the total area of ​​late rice. Since the large-scale popularization and cultivation in the mid and late 1970s, the variety has shown high disease-resistant yield and played an important role in improving yield of late rice. In recent years, however, quite a few areas in our region have reported that the resistance of Shanyou 6 to rice blast has decreased and the incidence has become more and more common. In some areas, it is quite serious. This kind