从品种搭配、栽培技术等方面寻找减轻三化螟为害的措施,是经济有效而又切实可行的。现将我们几年来的观察叙述如下: 一、三化螟发生期与水稻 生育期的关系 我县三化螟一般发生四代。第一、三代为害早、晚稻,造成枯心;第二、四代为害早、晚稻,造成白穗。发生期大致是:第一代为4月上中旬至5月中下旬;第 Looking for ways to mitigate the damage of the rice stem borer (Borer) by combining varieties and cultivation techniques is economically effective and practical. The observations we have made over the past few years are as follows: First, the relationship between the occurrence of rice stem borer and rice growth stage Myrrh borer occurs generally four generations. The first and third generations harmed the early and late rice, resulting in dry heart; the second and fourth generations harmed the early and late rice, resulting in white spike. The occurrence period is roughly: the first generation from April on mid-May to mid-late;