【目的】 为明确瓜氨酸对锯叶裂臀瓢虫Henosepilachna pusillanima（Mulsant）成虫取食的影响。【方法】 本研究设置取食非选择性和取食选择性试验，用南瓜Cucurbita moschata Duchesne制作叶盘，将叶盘喷施20 mmol∙L^－1和60 mmol∙L^－1的瓜氨酸后，测定锯叶裂臀瓢虫雄虫和雌虫在24 h内的取食面积，并计算取食选择的百分率，以喷施去离子水的叶盘为对照。【结果】 非选择性试验结果表明，不同处理的锯叶裂臀瓢虫雌虫的取食量均显著大于雄虫（P<0.05）。喷施20 mmol∙L^－1和60 mmol∙L^－1的瓜氨酸后，对雄虫和雌虫的取食具有显著的抑制作用（P<0.05）。喷施20 mmol∙L^－1和60 mmol∙L^－1的瓜氨酸后雄虫的取食面积比对照（5.32 cm²）分别减少36.88%和49.33%，雌虫的取食面积则比对照（7.60 cm²）分别减少42.08%和53.36%。但雄虫和雌虫的取食量在两个瓜氨酸处理之间都没有显著差异。在选择性试验中，雄虫和雌虫明显偏好于取食对照叶盘。【结论】 瓜氨酸对锯叶裂臀瓢虫成虫的取食具有抑制作用，这为该虫划圈行为机制的研究提供了新的思路和证据。

[Objectives]  To explore whether the feeding of Henosepilachna pusillanima adults is affected by applying citrulline, one of major components of cucurbit phloem sap. [Methods]  No-choice and triple-choice assays were performed using leaf discs from leaves of Cucurbita moschata Duchesne. Abaxial surfaces of the leaf discs were sprayed with either deionized water (control), or 20 mmol∙L^－1 or 60 mmol∙L^－1citrulline, respectively, and the amount of leaf area consumed by individual mated adult females and males that had been starved for 24 hours was measured. The percentage of leaf area consumed by individuals from each treatment group in the choice assays was also calculated. [Results]  Females consumed significantly more leaf material than males in all three treatments in the no-choice assays. Treatment with 20 mmol∙L^－1 or 60 mmol∙L^－1 of citrulline significantly reduced the amount of leaf consumed by males to 36.88% and 49.33%, respectively, of the 5.32 cm² consumed of by the control group. Similarly, treatment with 20 mmol∙L^-1 or 60 mmol∙L^-1 citrulline reduced consumption by females to 42.08% and 53.36%, respectively, of the 7.60 cm² leaf area consumed by the control group. There were, however, no significant differences between the two citrulline treatment groups in the leaf area consumed by either males or females. In choice assays, both males and females exhibited a strong preference for control leaf discs over those treated with citrulline.[Conclusion]  At certain concentrations, citrulline inhibits feeding by H. pusillanima adults, which provides new evidence of the mechanisms that underlie feeding behavior in this species.