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棉铃虫是我省棉花蕾,铃期的主要蛀食性害虫。一九七一年全国发生面积大、持续时间长,我省七、八月份(即棉铃虫第三、四代)有些棉区也遭受危害。为了准确掌握棉铃虫各虫态历期给预测预报工作提供资料,进一步搞好防治,今年,我组采取室内饲养观察和田间调查研究相结合的方法,对棉铃虫第一、二代虫态特点和历期进行了初步观察记载,现将有关材料整理如下; 一、第一代棉豁虫卵的历期以及形态特征: (一)历期: 今年黑光灯下四月二十八日始见蛾,五月十五日灯下第二次见蛾。在越冬蛹大量羽化的时候,于五月十九日和二十四.日分二批在观察圃烟草上定株定卵挂牌(即先定株编号,有卵
Cotton bollworm is the province of cotton buds, bollworm the main edible pests. In 1971, the area of the whole country took up a large area and lasted for a long time. Some cotton areas in Shaanxi Province in July and August (that is, the third and fourth generation of cotton bollworms) were also endangered. In order to provide accurate information on the status of each stage of the bollworm to provide information on the prediction and prediction work and to further improve prevention and treatment, this year, our group adopted the method of combining indoor rearing observation and field investigation to study the characteristics of the first and second generations of the cotton bollworm, And the history of a preliminary observation records, the relevant materials are now organized as follows; First, the first generation of cotton insect eggs of the period and morphological characteristics: (A) Duration: This year, the black light on April 28 Moth, saw moth for the second time under the lamp on May 15. In the event of a large number of overwintering pupa eclosion, on May 19 and April 24, two batches of plants were placed on a nursery-garden tobaccos to ovulate