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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%。
In order to understand the parasitism of parasitoid against Loxostege sticticalis L., two parasitic flies (Exorista civilis Rondani) and Nemorilla maculosa Meigen Larvae parasitism, parasitic sites and the amount of eggs, and through the indoor feeding on parasitic fly survival rate and host age, the location of the egg and the relationship between the amount of eggs were studied. The results showed that the two parasitic flies mainly larvae of the 5th instar larvae in the field, and the parasitic flies could range from 1 to 8 eggs per host larvae, with the majority of 1 (45.3%), 2 (33.6%). However, only one parasitic fly could emerge from one host larvae. Parasitic fly parasitized larvae had more head and thorax, fewer abdomen, parasitoid side, followed by back and least ventral . The survival of parasitic flies was correlated with that of host larvae. The survival rate of parasitic flies was only 66.7% among the host larvae with 1 larvae. In larvae with 2 or more larvae , The ratio of single head larvae to parasitic fly was 100%.