甘薯天蛾的生物学特性

通过室内饲养及野外调查，研究了温度对甘薯天蛾Herse convolvuli (L.)生长发育的影响、发育起点温度、有效积温、年生活史以及幼虫取食量、幼虫体色分化、成虫产卵前期和产卵量等生物学特性。结果表明，甘薯天蛾在长沙地区每年发生4代；幼虫共5龄；各虫态的发育起点温度分别为卵10.8℃、1龄幼虫20.7℃、2龄幼虫13.6℃、3龄幼虫14.3℃、4龄幼虫13.1℃、5龄幼虫12.9℃、蛹7.8℃，有效积温分别为45.1日۰度、11.2 日۰度、32.7日۰度、32.8 日۰度、36.6 日۰度、111.3 日۰度、252.1 日۰度；每雌产卵量43～665粒，平均276粒；产卵期2～6 d，产卵前期2～5 d；适宜交配和产卵的温度是23～30℃。光照强度是导致幼虫体色分化的主要原因。

Bionomics of Herse convolvuli (L.)

Bionomics of Herse convolvuli (L.) were studied, including development duration, life cycle, body-color diversity of larva, the effective accumulated temperature, development zero, fecundity of the adult and so on. The results showed that H.convolvuli had four generations per year in Changsha region. H.convolvuli had five stadia altogether. The development zero of H.convolvuli for eggs, the 1st instar larva, the 2nd instar larva, the 3rd instar larva, the 4th instar larva, the 5th instar larva, and pupae were determined respectively as 10.8℃, 20.7℃, 13.6℃, 14.3℃, 13.1℃, 12.9℃, and 7.8℃, while their effective accumulated temperature were 45.1 degree-day, 11.2 degree-day, 32.7 degree-day, 32.8 degree-day, 36.6 degree-day, 111.3 degree-day, and 252.1 degree-day, respectively. The fecundity was from 43 eggs to 665 eggs per female adult with an averge of 276 eggs. The preoviposition period and oviposition period were from 2 d to 5 d and from 2 d to 6 d，respectively. The optimal temperature for the adult to copulate and lay eggs were 23～30℃. Different illumination condition led to body-color diversity of larva.