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南县属双季稻主产区,第二代螟虫绝大部分随割下的稻草带出田外,堆放田埂时间长达一个多月,据调查,其中61.72％成为晚稻田的虫源。 撩穗收割,就是在早稻成熟时,将稻穗割下机械脱粒,随即灌水翻耕将稻草、稻秆和栖息在稻秆中的螟虫,翻入泥中窒息死亡。1989年,我县种植早稻46万多亩,撩穗收割44.5万亩,占早稻总面积的96.74％。割前的7月18日调查,第二代螟虫的密度平均3494条/亩,其中早稻田平均3154条/亩(稻草中占33.63％,稻秆中占
Nanxian is a double cropping rice producing area. Most of the second-generation stem borers leave the field with the straw they cut off. The time for piling up the fields is more than a month. According to the survey, 61.72% of them become the source of the late rice fields. Qilishan harvest, that is, in the early maturity of rice, the rice will be cut off mechanical threshing, irrigation followed by tillage straw, rice straw and rice stem borer in the stem borers, turn into mud asphyxiation death. In 1989, my county planted more than 460,000 mu of early rice and harvested 445,000 mu of grain, accounting for 96.74% of the total area of early rice. The survey on July 18 before cutting showed that the density of the second-generation stem borers averaged 3494 / mu, of which 3154 were on average in the paddy fields (33.63% in straw,