摘要
通过诱测、田间调查和室内饲养观察,泰安地区棉铃虫一年发生四代,第一代发生在麦田,第二至四代发生在花生田,主要为害叶片.二、三代棉铃虫发生轻重与虫源基数和温湿度有密切关系.通过微电脑程序对其发生因子的筛选,组建了二、三代棉铃虫发生预测式.中产花生田棉铃虫为聚集分布,可采用"Z"字型9点取样法调查.二、三代防治指标分别为百墩花生三龄前幼虫40～50头和30～40头.菊酯类和有机磷农药防效达80%以上.
Study Showed that the bollworm ( Heliothis armigera Hübner ) had four generations in a year in area of Taian.The first generation occurred in wheat field, the second to fourth generations occurred in peanut field, brought harm to leaves of crops mainly.The occurrence levels of second and third generations were closely correlated with base number of bollworm population, temperature and moisture. Using computer system to screen relevant factors, a formula of occurrence predication for the second and third generations was established.In the field of peanut with middle yield, the bollworm distributed in an aggregational pattern.The sampling method of nine points of Z-type could be empioyed to in vestigate the bollworm population in field.The control index of the second and third generations was 40-50 and 30-40 heads in 1-3 instars per hundred delves, respectively.They could be killed over 80%, using pyrethroids or organophosphorus pestcides.
出处
《山东农业科学》
1989年第3期9-14,共6页
Shandong Agricultural Sciences
