伞裙追寄蝇和双斑截尾寄蝇对草地螟的寄生特性  

Parasitism characteristics of two tachinid parasitoids Exorista civilis Rondani and Nemorilla maculosa Meigen(Diptera:Tachinidae) on the beet webworm,Loxostege sticticalis L.(Lepidoptera:Pyralidae)

作　　者：李红 罗礼智[1] 胡毅[1] 康爱国 

机构地区：[1]中国农业科学院植物保护研究所,植物病虫害生物学国家重点实验室,北京100094 [2]河北省康保县植保站,河北康保076650

出　　处：《昆虫学报》2008年第10期1089-1093,共5页Acta Entomologica Sinica

基　　金：国家科技支撑计划项目(2005BA529A03,2005BA529A04)

摘　　要：为认识寄生蝇对草地螟Loxostege sticticalis L.的寄生特性,调查了河北康保田间两种寄生蝇——伞裙追寄蝇Exorista civilis Rondani和双斑截尾寄蝇Nemorilla maculosa Meigen对草地螟各龄幼虫的寄生率、寄生部位及着卵量,并通过室内饲养对寄生蝇的存活率与寄主龄期、着卵部位及着卵量的关系进行了研究。结果表明：两种寄生蝇在田间主要寄生草地螟5龄幼虫;寄生蝇可在每头寄主幼虫上着1-8粒卵不等,其中以1粒的居多（45.3%）,2粒的次之（33.6%）,但1头寄主幼虫中仅能羽化出1头寄生蝇;寄生蝇以寄生寄主幼虫头部和胸部较多,腹部较少,并且以寄生侧面居多,背面次之,腹面最少。寄生蝇的存活与寄主幼虫着卵量之间呈相关关系,在着卵量为1粒的寄主幼虫中,寄生蝇的存活率仅为66.7%,在着卵量为2粒及以上的寄主幼虫中,单头幼虫羽化出寄生蝇的比例为100%。To understand the parasitism characteristics of tachinid parasitoids, Exorista civilis Rondani and Nemorilla maculosa Meigen （Diptera： Tachinidae） on the population of the beet webworm Loxostege sticticalis L. （Lepidoptera： Pyralidae）, the number and position of the tachinid eggs and the parasitism rate in various instars of L. sticticalis were investigated in a field population in Kangbao, Hebei province. The relationship between the tachinid parasitoid survival and the host instars and the number and position of tachinid eggs on the host larvae was also analyzed. The results showed that the parasitism rate on the 5th instar host larvae by the tachinid flies was the highest. The number of tachinid eggs deposited on the 5th instar larva by these two tachinid flies varied from 1 to 8 eggs per host larva, with one egg per host larva dominant （45%）, and followed by two eggs per host larva （33.6%）. However, only one tachinid maggot eould survive in a host. The tachinid eggs located more on head and thorax than on abdomen. Compared with the dorsal and abdominal sides of the host larvae, the lateral side was the most favorite side attacked by the taehinids. The survival rate of the tachinid progeny was highly related to their egg number on the host larva. Only 66.7 % of the host larvae with one tachinid egg each could produce a mature maggot, while 100% of the host larvae with more than two tachinid eggs each could produce a mature maggot.

关 键 词：伞裙追寄蝇 双斑截尾寄蝇 草地螟 寄生特征 存活率 

分 类 号：Q968[生物学—昆虫学]