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随着水稻面积的扩大、栽培制度的改变、杂交水稻品种的推广,以及不合理地施用农药,近年来北京郊区二化螟(Chilo suppressalis Walker)发生和危害加重。大兴县种植水稻30余万亩,产量占全县粮食作物总产量的一半左右,1980年二化螟发生11万亩.未防治面积上损失稻谷435.15万斤。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为害减产20-40%,严重者达60%。为了使防治工作在经济上,生态上及
With the expansion of rice area, the change of cultivation system, the popularization of hybrid rice varieties, and the unreasonable application of pesticides, the occurrence and harm of Chilo suppressalis Walker in Beijing suburb have increased in recent years. Daxing County has planted more than 30 million mu of rice, accounting for about half of the total output of grain crops in the county, and 110,000 mu of stem borer occurred in 1980. In the area not under control, the rice loss was 4.3515 million kg. The Shuangqiao farm also produces rice. In 1981, many paddy fields in the production team were reduced by 20-40% due to the damage caused by the rice stem borer, and 60% in severe cases. In order to make prevention and control work economically and ecologically