二点委夜蛾不同世代成虫适宜生境调查及其在作物间的转移规律研究

Studies on suitable habitat and migration pattern of different generations of Athelis lepigone

利用高效性诱剂对二点委夜蛾各世代成虫进行田间监测,发现其广泛分布于小麦、玉米、甘薯、棉花、花生、豆类等作物田,以及蔬菜地、果园、杂草荒地等当地几乎所有生境,且数量众多,单诱芯单日诱蛾量最高达727头。相对食物而言,二点委夜蛾更倾向于选择遮蔽、阴凉的地块栖息,其生存繁衍与田间生态环境关系密切。目前,越冬代及1代成虫主要分布于小麦田,数量显著高于其他生境;2代成虫数量最多、分布最广泛,但以棉花、甘薯、早播豆类、花生田较多;3代成虫数量急剧降低,适生环境有所集中,以甘薯、玉米、花生、豆类田等为主。二点委夜蛾数量大,分布范围广,已经成为河北省中南部发生地区为害夏玉米的常发性主要害虫。

Adults of Athelis lepigone of different generation widely distributed with big population and 727 of maximum numbers of moth trap by single sex pheromone in single-day in wheat, corn, sweet potatoes, cotton, peanuts, beans and other crop fields, as well as vegetable, fruit orchards, weeds and other uncultivated land were monitored by sex pheromone. A. lepigone preferred to cool and shady habitat, and there were close relationship between habitat and ecolog- ical environment. Currently, overwintering generation and first generation adults of A. lepigone were mainly distributed in wheat fields with significantly larger quantity than those in other habitats; second generation adults distributed widely with largest quantity, and mainly in cotton, sweet potato, sowing beans and peanut field. Third generation quantity reduced drastically, and mainly in sweet potato, corn, peanuts and beans field. A. lepigone with wild distribution and big popula- tion had become a major and recurrent pest of summer maize in central and southern Hebei province.