论文部分内容阅读
小地老虎（Agrotis ypsilon Rottemberg）是我国多种旱地作物苗期的重要害虫之一,也是世界性的大害虫。从我国已有的研究资料证明:它在北方不能越冬,在南方也有一个绝迹时期,能够越冬的面积不大;但每年春季从华南、西南到华东、华北辽阔的地区内,在同期间都有大批越冬代成虫出现,第一代幼虫的危害期亦基本一致,因而国内外多数分析都认为它是远距离迁飞性害虫。 害虫对药剂反应的敏感度与虫源地的防治有关。迁飞害虫由于迁移到不同地区或转移到不同寄主上,有利于稀释害虫的抗药性频率,促使抗药性发展缓慢。利用迁飞害虫的这一特性,检测不同地区的虫源对同一药剂反应的敏感度,研究它们之间是否具有异地同源的关系,以便从多方面来证实我国小地老虎在大范围内存在迁飞扩散的可能性。为此,1982～1983年对来自全国从南至北9个虫源地的小地老虎第一代幼虫,以六六六和敌百虫为试药进行毒力测定和抗性比较,现将结果简报如下。
Agrotis ypsilon Rottemberg is one of the most important pests in the seedlings of many dryland crops in China. It is also a large pest in the world. According to the available research data in our country, it can not be wintering in the north, there is also a period of extinction in the south and a small area capable of overwintering. However, in spring every year, from the areas of South China, Southwest China, East China and North China, A large number of overwintering generations of adults appear, the first generation of larvae are basically the same period of harm, and therefore most analysts at home and abroad that it is a long-distance migratory pests. Insecticide response to insecticide sensitivity and insect control. Migratory pests due to migration to different regions or transferred to different hosts, is conducive to dilute the frequency of resistance of pests, prompting the slow development of drug resistance. This characteristic of migratory pests was used to detect the sensitivity of insects in different regions to the same chemical reaction and to study whether they have heterologous relationships in different places in order to confirm in many aspects the existence of small tigers in our country The possibility of relocation. For this reason, from 1982 to 1983, the virulence and resistance comparison of the first-generation larvae of Lithocarpus japonicus from nine southern to northern areas in China were compared with that of six hundred sixty-six and trichlorfon. The result briefing is as follows.