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桐乡县位于杭嘉湖平原中部,是一个单季稻和连作稻混栽区,水稻二化螟全年发生三代,发蛾高蜂期,一代在5月下旬,二代在7月中旬,三代在8月下旬至9月上旬。近几年来,二化螟为害早稻渐趋严重,至1964年其为害性已大大超过三化螟,虽然全面防治,螟害损失率仍达0.6%,比三化螟重1倍多。为了做好二化螟的防治工作,我们总结了二年来在
Tongxiang County is located in the central part of Hangzhou-Jiaxing-Huzhou plain. It is a single-cropping rice and continuous cropping paddy planting area. Rice stem borer occurs three generations throughout the year, with high bee-moth period. The first generation is in late May, the second generation is in mid July, the third generation is in late August To early September. In recent years, the damage caused by the rice stem borer early rice is becoming more serious, to 1964 its harmfulness has greatly exceeded the borer, although comprehensive control, the damage rate is still up to 0.6%, more than double the borer more than three times. In order to do a good job in the prevention and treatment of stem borer, we concluded in two years