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随着水稻面积的扩大,栽培制度的改变,杂交水稻的推广以及不合理使用农药,近年来北京郊区二化螟Chilo suppressalis walker发生和危害严重。大兴县种植水稻三十余万亩,占全县粮食作物总产量的一半左右,1980年二化螟发生十一万亩,仅未防治地区损失稻谷就达435.15万斤。东郊双桥农场也以生产水稻为主,1981年有许多生产队的稻田因受二化螟危害减产20-40%,严重者达60%。西郊东北旺农场的大片稻田,1982年二化螟发生危害亦十分严重。在北郊,多认为二化螟发生不重,但实际调查亦并非如此。1985年10月21日
With the expansion of rice area, the change of cultivation system, the popularization of hybrid rice and the unreasonable use of pesticides, Chilo suppressalis walker in the outskirts of Beijing occurred and was seriously damaged in recent years. In Daxing County, more than 300,000 mu of rice is planted, accounting for about half of the total output of grain crops in the county. In 1980, 111,000 mu of rice stem borer occurred and only 4.3515 million jin of rice was lost in areas that were not under control. The Shuangqiao farm in the eastern suburbs is also dominated by rice production. In 1981, many paddy fields in the production team suffered a 20-40% reduction in output and 60% in serious cases due to the damage caused by the stem borer. In the western suburbs of northeast Wang farm paddy fields, in 1982 the occurrence of two borers is also very serious. In the northern suburbs, many think that the occurrence of rice stem borer is not heavy, but the actual investigation is not the case. October 21, 1985