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银纹夜蛾(Phytometra agnata Staud.)群众众叫“豆青虫”、“豆步曲”,是近年来我区新发展起来的一种大豆害虫。1960—1962年曾连续发生,1961年8月初全县发生面积达13万多亩,一般单株虫口3-5头,多至数十头,大豆被害减产15％左右。 经过两年的饲养观察,初步结果整理如下。 (一)生活习性 银纹夜蛾在我县一年发生1—2代。6月下旬始见成虫,7月后蛾量增多。成虫白天潜藏在茂密的豆棵间,傍晚开始飞舞,飞翔很快,阴天白昼也有活动。趋光性弱。7月中旬为产卵盛期,卵散产于豆叶背面,经三、五天孵化幼虫。7月中下旬幼虫
Spodopterata nodosum (Phytometra agnata Staud.) The masses called “bean pests”, “beans step song”, is a newly developed soybean pests in our area in recent years. From 1960 to 1962, it happened continuously. In early August, 1961, the area of the whole county was over 130,000 mu. Generally, there were 3-5 insect heads per plant, up to several dozen, and the soybean yield was reduced by 15%. After two years of keeping observations, the preliminary results are organized as follows. (A) lifestyle habits Spodoptera louse occurred in our county 1-2 generations a year. In late June saw adults, moths increased in July. Adults lurking in the dense beans during the day, early evening flying, flying fast, there are cloudy day activity. Light phototaxis weak. In mid-July is the peak of spawning, eggs scattered in the back of bean leaves, after three or five days hatching larvae. Late July larvae