论文部分内容阅读
苏铁小灰蝶是苏铁上的主要害虫。近年来,随着园林城市、生态城市和农村城市化的建设和发展,苏铁已成为美化环境不可缺少品种之一。苏铁在北京市的栽培量逐年增加,苏铁小灰蝶的发生程度也逐年加重,个别花圃曾经出现当年新叶全被吃光的现象。生活史及为害特点该虫在北京地区7月份完成一个世代约20天,其中卵期3天,幼虫期5~7天,蛹期8天,羽化后成虫第2天产卵。该虫在北京地区于5~11月发生,为害盛期为6月中旬~10月中旬。成虫将卵散产
Cycas small butterflies are the main pests on the cycads. In recent years, with the construction and development of garden cities, eco-cities and rural urbanization, the CYT has become one of the indispensable varieties to beautify the environment. The cultivation of cycads in Beijing has been increasing year by year. The incidence of Cyclotella sibirica has also been increasing year by year. Some flower gardens once appeared the phenomenon of new leaves being eaten all year long. Life history and pests characteristics The insect in Beijing in July to complete a generation of about 20 days, of which 3 days egg stage, larvae 5-7 days, pupa 8 days, emergence of adult eggs after 2 days. The insects in Beijing from May to November occurred, the peak of damage for mid-June to mid-October. Adults disperse their eggs