【目的】 为明确天敌昆虫东亚小花蝽Orius sauteri对重大农业害虫禾谷缢管蚜Rhopalosiphum padi的防控潜能。【方法】 本研究在实验室条件下，系统评估了东亚小花蝽对禾谷缢管蚜成虫的捕食功能反应与搜寻效应，并进一步探究了种内干扰对其捕食效率的影响。【结果】 东亚小花蝽5龄若虫和雌、雄成虫对禾谷缢管蚜成虫的捕食功能反应同时符合Holling Ⅱ和Holling Ⅲ两种模型；Holling Ⅱ模型拟合结果显示，东亚小花蝽5龄若虫和雌、雄成虫对禾谷缢管蚜成虫的瞬间攻击率分别为0.764、0.802和0.754，控害效能分别为11.274、18.670和10.196，其中雌成虫的控害效能最高；Holling Ⅲ模型拟合结果显示，东亚小花蝽5龄若虫和雌、雄成虫对禾谷缢管蚜成虫的日最大捕食量分别为11.250、16.030和10.620头，最佳寻找密度分别为7.326、9.386和7.258头/皿；东亚小花蝽对禾谷缢管蚜成虫的搜寻效应与猎物密度呈负相关，每头天敌的捕食量同样与其自身密度呈负相关。【结论】 东亚小花蝽对禾谷缢管蚜具有较好的生防应用潜能。

[Aim]  To evaluate the potential of the predatory bug Orius sauteri (Hemiptera: Anthocoridae) to act as a biocontrol agent for the economically important bird cherry-oat aphid Rhopalosiphum padi (Hemiptera: Aphididae). [Methods]  Under controlled laboratory conditions, this study systematically evaluated the functional response and searching efficiency of O. sauteri preying on adults of R. padi, and further explored the effects of intraspecific interference on its predation efficiency under different natural enemy densities. [Results]  Predatory functional responses of both 5th instar nymphs and adults fitted both the Holling II and Holling III equations. In the Holling II model, the attack efficiencies of 5th instar nymphs, and female and male adults were 0.764, 0.802, and 0.754, respectively, and their respective predation capacities were 11.274, 18.670, and 10.196. Adult females were the most efficient predators of R. padi. In the Holling III model, 5th instar nymphs, and female and male adults had a daily maximum consumption of 11.250, 16.030, and 10.620 individuals, respectively, and an optimal search density of 7.326, 9.386, and 7.258 individuals per dish, respectively. Search efficiency was negatively correlated with predator density, and average individual predation capacity was negatively correlated with the density of O. sauteri. [Conclusion]  These results suggest that O. sauteri could be an effective biological control for R. padi.