稻田越冬螟虫死亡率的高低,和第二年水稻螟灾轻重的关系,相当密切;特别是对于早稻螟灾,更有直接影响,所以查清某一地区越冬螟虫的死亡情况,在预测预报工作中,是有它的重要意义的。过去对于螟虫死亡率的计算方法,常只将检查当时所得的死虫数字除以死活虫总数,这种算法,在籼稻地区,据作者近几年来采用的结果,是有很大偏差的,几乎完全不能代表当地越冬蝗虫死亡的实际情况,现特提出修正意见及在取样上存在的几个问题如下,供大家 The mortality of overwintering stem borers in paddy fields is very close to that of the second year of rice borer catastrophe. Especially for the early rice borer catastrophe, it has a more direct impact on the mortality rate of overwintering stem borers in a certain area. In forecasting and forecasting work, It is of great importance. In the past, the calculation of the mortality rate of stem borers often only divided the number of dead insects examined at that time by the total number of dead and living dead worms. This algorithm, in the indica rice region, has been greatly biased by the author’s results in recent years. Almost Completely unable to represent the actual situation of the overwintering locusts in the area, the amendments and suggestions on sampling are as follows