去年我們在玉林农业試驗站的基点——北流河村公社第26生产队进行了三化螟发生时期的預测与防治,获得了显著的效果。 預測的方法是采用期距测算的。据玉林农試站对三化螟飼养观察,各虫态历期为: 成虫寿命一般是2—4天。卵态历期,第一代为9—11天,第二、三、四代为6—8天,第五代为10—13天。幼虫历期如下表: Last year, we conducted the prediction and control of the occurrence of the rice stem borer (Chilo suppressalis) at the base of the Yulin Agricultural Experimental Station, the 26th production team of Beiliuhecun commune, and achieved remarkable results. The method of forecasting is based on period measurements. According to Yulin agricultural test station on the three borer feeding observation, the worm period: adult life is generally 2-4 days. Egg-shaped period, the first generation of 9-11 days, second, third and fourth generation of 6-8 days, the fifth generation of 10-13 days. The larvae duration is as follows: