The parasitic wasps Tiphia popilliavora Rohwer are excellent natural enemy to control underground pest Holotrichia parallela Motschulsky in Rizhao City, Shandong Province. The biology and ecology of the T. popilliavora and its control effect on the level of H. parallela were continuously observed in laboratory and in field from 2008 to 2014. T. popilliavora are external parasitic natural enemy which have a certain specialization for the host and have only one host. Females lay eggs in vitro host, the natural parasitic rate is from 36.4%to 48.3%, its offspring also complete development in vitro host. The emergence and unearthed time of wasps which had over the winter were from mid July to late August each year, the peak period were from late July to early August, this is just consistent with the hatch peak of H. parallela larvae, reflecting the significant following effect. T. popilliavora has become a local dominant natural enemies in bumble bee species after planting kenaf, help moving and protecting the wasps year after year. The population density of H. parallela has significantly decreased from 14.37/m2 to 0.21/m2 in peanut fields in Rizhao City, Shandong Province, showing a good control pest effect of help moving and protecting natural enemies.%弧丽钩土蜂是山东半岛地下害虫暗黑鳃金龟的优势寄生性天敌，通过连续7年对弧丽钩土蜂生物学习性观察及其对暗黑鳃金龟田间寄生效果的调查，总结了弧丽钩土蜂的生物学习性，证实了其对寄主的跟随效应，评价了田间控制效果。弧丽钩土蜂属外寄生性天敌，单寄生，对寄主有一定的专化性，雌蜂产卵于寄主体外，自然寄生率为36.4%～48.3%，其子代亦在寄主体外完成发育。越冬代羽化出土时间为每年7月中下旬至8月下旬，出土高峰期为7月下旬至8月上旬，恰与暗黑鳃金龟幼虫孵化高峰期吻合，体现了显著的跟随效应。通过连年种植红麻、助迁土蜂、保护土蜂的措施，弧丽钩土蜂已成为当地土蜂类天敌的优势种。山东省日照地区花生田内，暗黑鳃金龟的虫口密度已显著降低，从最高年份的14.37头/m2下降到目前的0.21头/m2，显示了保护助迁天敌昆虫的良好治虫效果。
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