夹竹桃天蛾的生物学特性.PDFVIP

昆虫知识 Chinese Bulletin of Entomology 20 10 ，47 (5 ):9 18 ～ 922 夹竹桃天蛾的生物学特性*  雷玉兰 林仲桂 ( 42 1005 ) 湖南环境生物职业技术学院 衡阳  Bionomics of the oleander hawkmoth ，Dap hnis nerii. LEI Yu-Lan ，LIN Zhong-Gui (College of Hunan Environment-Biolog ical Polytechnic ，Hengyang 42 1005 ，China) Abstract The oleander hawkmoth ，Dap hnis nerii (Linnaeus )is a serious pest of the garden plant ，Nerium indicum Mill . D . nerii has two or three generations per year in the Hengyang area ，Hunan Province ，over- wintering as pupae under the layer of the dead branches and fallen leaves ，in loose topsoil and in cracks and holes in the earth near the host plant . The adults of the over-wintering generation emerge in the first ten days of June and oviposit between the middle and last ten days of June . The first generation larvae hatch in the last ten days of June and the first generation adults emerge in Mid-July and oviposit in the last ten days of July . The second generation larvae hatch in the first ten days of August . Plant damage is most severe from the last ten days of August to the first ten days of September . Larvae begin to pupate in mid-September ，pupation continuing until mid-October . The second generation pupae differentiate into two groups ，one of which becomes over-wintering pupae ，and the other becomes second generation adults which lay the third generation eggs. The third generation larvae hatch in the first ten days of October and over-winter as pupae from mid-November . Key words Dap hnis nerii