草地螟寄生蝇寄生规律及控害作用研究

田间调查和室内饲养观察表明,康保县草地螟的寄生蝇主要有伞裙追寄蝇、双斑截尾寄蝇等5种。草地螟寄生蝇一般只寄生幼虫,未见寄生其他虫态。寄生率随草地螟幼虫密度增大、虫龄增长而迅速升高。多年发生资料分析,寄生蝇寄生率高的年份,下年草地螟的发生为害程度明显减轻。

Study on parasite characteristics of parasitic fly of Loxostege sticticalis linnaeus and control effects of its parasites

Based on field investigation and indoor rearing in Kangbao county, it is showed that there were five kinds of parasitic flies of Loxostege sticticalis innaeus, namely Exorista civilis Rondani, Nemorilla maculosa Meigen and the other three species. These parasitic flies only parasited the larvae of Loxostege sticticalis innaeus, but can not parasitized Loxostege sticticalis in its other life stages. Parasite rates increased quickly with the increase of larva population density and instars. Analysis on occurring data of Loxostege sticticalis innaeus for many years revealed that the damage caused by Loxostege sticticalis innaeus reduced significantly in the year of its high parasite rates.