夹竹桃天蛾Daphnis nerii(Linnaeus)是夹竹桃上的重要害虫,具有间歇性爆发的特点。该虫在湖南省衡阳地区1年发生2～3代,以蛹在寄主附近的枯枝落叶层、表层松土及土壤缝穴中越冬。越冬代成虫于6月上旬出现,6月中下旬产卵。6月下旬第1代幼虫孵化;第1代成虫于7月中旬出现,7月下旬产卵。第2代幼虫8月上旬孵化,8月下旬至9月上旬幼虫危害最历害,9月中旬开始化蛹,化蛹持续到10月中旬。第2代蛹发生分化,一部分成为越冬蛹,另一部分则羽化为成虫。第2代成虫于10月上旬开始产下第3代卵。10月上旬第3代幼虫开始孵化,11月中旬第3代幼虫开始化蛹、越冬。 Daphnis nerii (Linnaeus) is an important pest on oleander with intermittent burst characteristics. The insects occurred in Hengyang, Hunan Province for 1 to 2 years and lived in winter with pupae in the litter layer near the host, topsoil and soil cracks. Overwintering generation adults appear in early June, mid-late June spawn. The first-generation larvae hatch in late June; the first-generation adults appear in mid-July and lay eggs in late July. The second generation of larvae hatch in early August, late August to early September larvae harms the hardest hit, mid-September began pupation, pupation continued until mid-October. The 2nd generation pupae differentiate, some become wintering pupae, and the other part emerge as adults. The 2nd generation adults started to give birth to 3rd generation eggs in early October. The third generation of larvae began to hatch in early October, and the third generation of larvae began to pupate and wintering in mid-November.