论文部分内容阅读
水稻纹枯病病菌寄生范围广,适应性强,在江苏省几乎所有稻区(早、中、晚稻)都有发生。全省常年受害面积约两千万亩,如果不防治,按轻发病年计算,估计每年要损失稻谷6.89亿斤。 一、防治纹枯病的经过 六十年代,我省开始施用有机砷农药苏农911(甲基硫化砷)与苏化6401(甲基砷酸钙)防治纹枯病;七十年代前期广泛使用,这类药剂防效高,残效期长,使水稻纹枯病的危害有所减轻,但也存在很多问题。一是对水稻不安全,很容易造成药害,而且用药适期的幅度狭窄,特别在发病高峰期——
Rhizoctonia solani has a wide range of parasitism and strong adaptability. Almost all rice areas in Jiangsu Province (early, middle and late rice) occur. The perennial area of pests in the province is about 20 million mu. If it is not to be prevented and treated, it will be estimated that 689 million jin of rice will be lost annually. First, the prevention and control of sharp eyespot disease After sixty time, our province began to use organic arsenic pesticides Su Ning 911 (methyl arsenic sulfide) and Suhua 6401 (Methyl arsenate) control sheath blight; widely used in the early seventies Such agents have high anti-efficacy and long residual period, which have lessened the damage of rice sheath blight, but there are also many problems. First, the insecurity of rice, it is easy to cause injury, but the narrow range of medication is suitable, especially in the peak incidence -