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二化螟是我省主要害虫,特别是早、中稻时期发生的第一代,是全年的主发代,每年均造成不同程度的危害。据我市农作物病虫测报站调查、越冬后虫口数量成倍增加,必须加强防治工作。 1996年4月上旬,涟源市农作物病虫测报站组织人员,通过选点取样,共调查3个乡4个村52丘稻田,平均每667平方米稻田有二化螟活幼虫5441条,密度大的达21631条,是近20年来密度最大的一年。较1995年、1994年分别增加20倍、108
Chilo suppressalis is the main pest in our province, especially the first generation occurred in the early and mid-rice period, which is the main generation of the whole year, causing different degrees of harm every year. According to the survey of crop pest stations in our city, after the winter, the population of pests multiplied, we must strengthen prevention and control work. In early April 1996, Lianyuan City Crop Pests and Diseases Report Station organized by sampling points, a total of 52 villages in 4 villages in 3 townships, 5441 live larvae per 667 square meters of paddy field, density Large up to 21,631, is the density of the past 20 years the largest year. Compared with 1995 and 1994, it increased 20 times and 108 respectively