The cranberry girdler, Chrysoteuchia topiaria (Zeller) (Lepidoptera: Pyralidae), is the most important sod webworm species attacking turfgrasses in Quebec, Canada (Simard 2001). Unlike other webworms, the cranberry girdler is rarely observed on grass blades but feeds on the crowns and roots in the thatch. Biopesticides based on a nematode–bacterium complex appear to hold promise as a means of controlling turfgrass insect pests, particularly those that colonize the thatch and the first few centimetres of soil (Potter 1998), such as the cranberry girdler (Georgis and Hague 1991). Our objective was to assess the susceptibility of the cranberry girdler to entomopathogenic nematodes. In the laboratory, we determined the LC50 values for four nematode species and evaluated the effect of contact time on host mortality.
蔓越橘网虫 Chrysoteuchia topiaria (Zeller)(鳞翅目:鳞翅目)是危害加拿大魁北克省草皮的最重要的草皮网虫种类(Simard 2001)。与其它网虫不同的是,蔓越橘网虫很少在草叶上观察到,而是在茅草的冠部和根部取食。以线虫-细菌复合体为基础的生物杀虫剂似乎有望成为控制草坪害虫的一种手段,尤其是那些在茅草和最初几厘米的土壤中定植的害虫(Potter,1998 年),例如蔓越莓钩虫(Georgis 和 Hague,1991 年)。我们的目标是评估蔓越莓束带虫对昆虫病原线虫的易感性。在实验室中,我们测定了四种线虫的半致死浓度值,并评估了接触时间对宿主死亡率的影响。