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淮安市楚州区地处淮河中、下游,种植制度以稻麦两熟为主,年种植水稻面积6.67万hm2。自20世纪90年代后期以来,水稻纹枯病发生程度明显回升,每年的平均穴发病率都在50%左右。自2005年以来,其发生程度更是急剧上升,不仅穴发病率高达50%以上,且株发病率也高达20%以上,尤其以2007年为重,病害稳定期调查,平均穴发病率达88.33%,株发病率高达45.63%,是近20年来,最重的1年。对此,我们调查分析认为,水稻纹枯病发病加重与防治时间的推迟,药剂选择以及氮肥施用量有很大的关系,并结合实际,提出了相应的解决方法。
Chuzhou District of Huaian City is located in the middle and lower reaches of the Huaihe River. The planting system is dominated by rice and wheat. The annual area of paddy rice is 66,700 hm2. Since the late 90s of the 20th century, the occurrence of sheath blight of rice has picked up markedly, with the average annual incidence of holes being around 50%. Since 2005, the occurrence rate has risen sharply. Not only the incidence of acupoints is as high as 50%, but also the incidence of strains is as high as above 20%. Especially in 2007, the average disease incidence was 88.33 %, The incidence of strains up to 45.63%, is the last 20 years, the heaviest one year. In this regard, our investigation and analysis believe that the incidence of rice sheath blight disease and control of the delay, the choice of pesticides and the amount of nitrogen fertilizer have a great relationship, combined with the actual, put forward the corresponding solution.