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自1987年以来,一代稀点雪灯蛾(Spilo-soma urticae Esper)在我省已成为麦套玉米的主要害虫。轻者玉米小苗受害,重者缺苗断垄,甚至翻种。为经济有效地控制一代稀点雪灯蛾的危害,于1990——1992年,对其为害损失率和防治指标进行了研究。1 试验内容与方法1.1 人工接虫测定危害损失率选择有代表性的麦田进行试验,每小区种20株玉米,用纱网笼罩。分别接虫1、2、4、5、6头,以不接虫为对照,共6个处理,随机排列,重复3次。当套种玉米正值二叶一心时,大田幼虫正处三龄盛期,接三龄末
Since 1987, a generation of Spilo-soma urticae Esper has become the major insect pest of corn in our province. Light seedlings suffering from corn seedlings, severe lack of seedlings broken ridge, and even transplanted. In order to economically and effectively control the hazard of a generation of snowdrop moth, the damage loss rate and prevention and control index were studied in 1990-1992. 1 Test content and methods 1.1 Artificial insects Determination of harm loss rate Select a representative of the wheat field trials, 20 kinds of corn per district, covered with gauze. Respectively 1, 2, 4, 5, 6 head to not take the worm as a control, a total of 6 treatment, random arrangement, repeated 3 times. When the intercropping corn is at the center of the second leaf, the larvae of the field are at the height of the third age and end at the third age