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二化螟是我省水稻的主要害虫,在虫情测报工作中通常是根据它的幼虫的体长和背线的变化进行分龄。用这种方法划分龄期,常因食料、营养等条件的不同,容易把龄期搞错,影响到测报的准确性,不能稳、准、狠地消灭害虫。 为了解决这一问题,笔者从1973年开始,观察二化螟幼虫背板变化规律,采取室内饲养与田间剥检相印证的办法,从1—4代有系统地进行。每代挑选同样大小的幼虫20条,放在装有水和禾苗的指形管内饲养,每管接入一虫,禾苗发生枯心后,再换入一根新鲜禾苗,直至化蛹为止。每次接虫时小心剥取,避免搞死幼虫。整个饲养期
Chilo suppressalis is the main pest of rice in our province, in insect detection work is usually based on its larvae body length and top line change of age. Divided by this method of age, often due to different food, nutrition and other conditions, it is easy to make mistakes age, affecting the accuracy of the newspaper, can not be stable, accurate and relentless elimination of pests. In order to solve this problem, the author began to observe the change rule of the larvae backfat of the stem borer, Chilo suppressalis, from 1973 and adopted the method of indoor rearing and field inspection, which was carried out systematically from 1-4 generations. Each generation selects 20 larvae of the same size and feeds them in finger tubes filled with water and seedlings. Each tube is connected with a worm. After the seedlings have withered, they are replaced with fresh grasses until their pupation is completed. Carefully peeled each time to get rid of insects, to avoid dead larvae. The whole feeding period