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棉铃虫是辽宁省棉、粮、菜等作物的主要害虫之一。据目前调查研究分析,此虫在我省基本不能越冬,其虫源主要来自黄淮流域。为弄清当年各代虫源性质、比例,给发生预测和防治提供依据,我们在参考有关资料(李汝锋等,1987)的基础,制定了本省棉铃虫卵巢发育的分级,方法简单,便于掌握。1 试材来源和方法1.1 于1992年7—9月,采用20瓦黑光灯和杨枝把逐日诱到的雌蛾;同期从棉田采集500头幼虫,带回室内饲养,至羽化为成虫。
Cotton bollworm is one of the main pests of cotton, grain and vegetables in Liaoning Province. According to the current investigation and analysis, this pest in our province can not winter, its source mainly from the Huang-Huai River. In order to find out the nature and proportion of insect sources in different generations and provide basis for occurrence and prevention, we formulated the classification of ovarian development of H. armigera in our province with reference to relevant data (Li et al., 1987). The method is simple and easy to master. 1 Source and methods of test material 1.1 From July to September 1992, 20-watt black light lamps and poplar were used to induce female moths on a daily basis. In the same period, 500 larvae were collected from the cotton fields and reared indoors for emergence into adults.