四川省常年种植水稻4600多万亩,以杂交稻为主,占水稻面积的91.3%。稻瘟病为本地水稻的重要病害,近几年发病面积不断扩大,由1989年的238.7万亩,扩大到1992年的683.5万亩;发病县由1989年的21个,到1992年已增至123个,危害损失由1989年的0.38亿公斤,增加到1992年的0.83亿公斤。稻瘟病已成为制约我省稻谷生产的重要因素,需要加强防治,现提出如下对策,供 The perennial planting of rice in Sichuan Province is more than 4600 mu, mainly hybrid rice, accounting for 91.3% of the total rice area. Rice blast is an important disease of local rice. In recent years, the disease area has been expanding continuously, from 2,387,000 mu in 1989 to 6,835,000 mu in 1992; from 21 in 1989 to 123 in 1992 The damage caused by the damage increased from 38 million kilograms in 1989 to 83 million kilograms in 1992. Rice blast has become an important factor restricting rice production in our province, and we need to step up prevention and control. Now we put forward the following countermeasures