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一、发生趋势预测水稻是四川的主要粮食作物,常年种植面积在4,700万亩左右,近年来,随着杂交稻种植面积逐渐扩大,施肥水平和密植程度提高,纹枯病发生面越来越大,危害程度日趋严重,预计今后五年将成为四川稻区的头等严重病害,其主要依据是: (一)菌源十分广泛:据西南农业大学颜思齐等研究,水稻、玉米、小麦纹枯病和棉花立枯病四种病菌都能侵染水稻、玉米和小麦,并表现类似或相同的病状。四川常年种植玉米2,400万亩左右,小麦3,000万亩左右,近年来此两种作物的纹
I. Trend Forecasting Rice is the main food crop in Sichuan with a perennial acreage of about 47 million mu. In recent years, as the hybrid acreage has been gradually expanded, the level of fertilization and planting density have increased, and the occurrence of sheath blight has been increasing , The degree of endangerment is becoming more and more serious. It is estimated that in the next five years it will become the first serious disease in the rice area of Sichuan Province. The main basis is: (1) A wide range of bacterial sources: According to research by Yan Siqi of Southwest Agricultural University, rice, corn, All four cotton blight pathogens can infect rice, corn and wheat and show similar or identical symptoms. In Sichuan, about 24 million hectares of corn are planted year-round and about 30 million hectares of wheat are planted in recent years