汕头毛健夜蛾生物学特性及防治措施

毛健夜蛾(Brithys crini)主要为害石蒜科植物。该虫在汕头1年发生5代,以蛹越冬。越冬代成虫于3月下旬开始羽化。幼虫有6龄。第1代幼虫于4月中旬开始孵化,4～12月均可见幼虫为害,以7～10月为害最重。卵期5～11 d,蛹期10～13 d,成虫期4～6 d。成虫有趋光性。毛健夜蛾的寄主有葱兰(Zephyranthes candida)、文殊兰(Crinum asiaticum var.sinicum)、朱顶红(Hippeastrum vittatum)等石蒜科植物,此外,还取食紫鸭跖草(Setcreasea purpurea)、芥蓝(Brassica alboglabra)、菠菜(Spinacia oleracea)等植物。药剂防治可选用米满、0.36%苦参碱、10%烟碱、25%灭幼脲3号。

Biological Characteristics and Control of Brithys crini in Shantou City

Brithys crini mainly damages Amaryllidaceae plants.It had five generations a year and overwinters as pupae in Shantou city,China.The adults of overwintering emerges in late March the next year.The larvae had six ages.The larvae of the first generation hatched in mid-April.They happened from April to December and the serious damage is between July and October.The egg stage was 5～11 days,the pupal stage was 10～13 days and the adult stage was 4～6 days.A phototaxis of the adult was proved.Their hosts were Amaryllidaceae plants,such as Zephyranthes candida,Crinum asiaticum var.sinicum,Hippeastrum vittatum and so on.In addition,they are Setcreasea purpurea,Brassica alboglabra and Spinacia oleracea.Tebufenozide,0.36% matrine,10% nicotine and 25% chlorbenzuron were used to control the larvae,and a good effect was obtained.