[Objectives]  To investigate potential ways to utilize the invasive plant species Praxelis clematidea (Griseb.) R. M. King & H. Rob. The repellence and lethality of floral essential oils of this plant to the Asian citrus psyllid pest Diaphorina citri Kuwayama were determined, and the potential for using these essential oils to control insect pests is discussed. [Methods]  Essential oil yield was determined for different plant parts using the steam distillation method. Floral essential oils were examined using gas chromatography-mass spectrometry (GC-MS), and their repellence and lethality to D. citri were determined. [Results]  Essential oil yield from P. clematidea flowers (0.31±0.03) % was higher than from leaves and stems (0.23±0.02) %. About twenty-five essential oil constituents were identified, the major constituents being β-Cubebene (43.85%) and β-Caryophyllene (30.34%). Oil concentrations of 40 μL·mL^-1 and 50 μL·mL^-1 had 100% repellence rate after 30 min. Different concentrations of floral essential oils from P. clematidea varied markedly in lethality to D. citri. Using the immersion method with LC₅₀ values of 44.83 μL·mL^-1, concentrations of 50 μL·mL^-1 had a corrected mortality of (56.25±4.79)% after 18 h. In contrast, the fumigation method with LC₅₀ values of 24.80 μL·mL^-1 had a corrected mortality rate of (66.33±5.00) after 48 h. The main components of the P. clematidea essential oil can effectively repel and kill D. citri. [Conclusion]  Floral essential oils of P. clematidea have significant repellent and lethal effects on D. citri and therefore have potential as repellents and insecticides.