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褐稻虱是我省苏北中稻区水稻的主要害虫。其发生危害规律与苏南和沿江稻区不同,迁入代成虫通过其子代的繁殖,到第三个世代暴发危害,即形成迁入代→繁殖代→主害代的隔代暴发型相。由于夏季的温湿条件(尤其是田间小气候)和水稻生育期(特别是杂交稻)对于褐稻虱的栖息和取食都较苏南稻区适宜,故其增殖势也较苏南单季晚稻强。该区自八十年代迄今大发生的频率为46%,中等以上发生频率达77%。据此,提出在苏北中稻区对褐稻虱采取“治(2)代控(3)代”的药剂防治策略。
Brown planthopper is a major pest of paddy rice in northern Jiangsu province. The occurrence of harmful law and the southern Jiangsu and along the rice area is different from the migration into the adult through its offspring of reproduction, outbreak of harm to the third generation, that is, from generation to generation → generation → offspring of the main generation of the offensive phase . As summer warm and humid conditions (especially in the field microclimate) and rice growth period (especially hybrid rice) for the brown planthopper habitat and feeding are more suitable for southern Jiangsu rice area, so its proliferation potential than single-season southern Jiangsu Strong. The area has seen a 46% frequency of occurrence since the 1980s and a frequency of 77% above the average. Therefore, it is proposed that the strategy of controlling (2) substituting control (3) on brown planthopper in the middle area of northern Jiangsu province is proposed.