小猿叶甲成虫越冬和越夏:滞育和休眠同时存在

小猿叶甲Phaedon brassicae Baly是十字花科蔬菜上的一种重要害虫,具有复杂的生活史。2005～2006年在武汉地区对小猿叶甲越冬和越夏虫态及成虫生理状态的调查结果表明,小猿叶甲只以成虫越夏,主要以成虫越冬,但也有少量卵、幼虫和蛹越冬。越夏期间,滞育成虫占70.5%～97.1%。越冬期间,滞育成虫的比率占24.8%～48.2%,随越冬进程,滞育比率上升,但大部分个体处于休眠状态。

Over-wintering and over-summering of adults of the brassica leaf beetle, Phaedon brassicae: concurrence of diapause and quiescence

The brassica leaf beetle Phaedon brassicae Baly (Coleoptera: Chrysomelidae), one of the serious pests infesting cruciferous vegetables, shows a complex life history. The over-wintering and over-summering stages, and the physiological states of adults were investigated in this species in Wuhan during 2005 to 2006. The field investigations showed that adults were able to over-summer and over-winter successfully, but few eggs, larvae and pupae could also survive in winter in Wuhan. Percentages of diapaused adults ranged from 70.5% to 97.1% during summer. Proportions of diapaused adults showed an increasing trend during winter, and ranged from 24.8% to 48.2%. Most of adults over-wintered in the stage of quiescence.