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缙云县约有4.5万亩单季稻,主要分布在山荫重、日照不足、雾多露重、昼夜温差大的山区,该生境有利于多种水稻病害的发生与流行。进入90年代以来,穗瘟、纹枯病、褐色叶枯病、稻曲病等多种病害发生严重,成为单季稻高产的最大障碍。现就单季稻穗期病害的发生特点及防治对策作一介绍。1.发生特点(1)纹枯病该病自80年代上升为主要病害后,进入90年代以来,连年大发生或偏重发生,年发病面积达4.2万亩,约占单季稻种植面积的90%以上。预计在今后数年内,该病仍将保持严重发生态势,其危害损失仍居水稻病害之首。主要依据为:纹枯病病原菌、水稻品种、栽培技术、气象条
About 4.5 million mu of single-season rice in Jinyun County is mainly distributed in mountainous areas with heavy shade, insufficient sunlight, heavy fog and heavy temperature difference between day and night. The habitat is conducive to the occurrence and prevalence of various rice diseases. Since the 1990s, severe diseases such as head blast, sheath blight, brown leaf blight and false smut have become serious problems, becoming the biggest obstacle to the high yield of single-cropping rice. Now on the characteristics of single season rice panicle diseases and prevention and control measures to make an introduction. 1. Occurrence characteristics (1) Sheath blight disease since the 1980s rose to a major disease, into the 90’s, successive years occurred or biased to occur, the annual incidence of up to 4.2 million mu, accounting for more than 90% of single-cropped acreage . It is estimated that in the next few years, the disease will still maintain a serious trend and its damage will still be the first damage caused by rice diseases. The main basis for: sheath blight pathogens, rice varieties, cultivation techniques, weather conditions