【Background】 Procecidochares utilis Stone is an obligatory parasite of Eupatorium adenophorum Spreng, and it has become an important factor in the control of E.adenophorum. The host selection of P.utilis adults is very important to control the growth of E.adenophorum, but few related studies are reported at present. 【Method】 The selection behavior of P.utilis female adults was tested using a Y-tube olfactometer on E.adenophorum, a selection of plants and E.adenophorum plants that were exposed to heavy metals. 【Result】 The selection behavior of P.utilis female adults of different ages on E.adenophorum showed no significant difference. Mating or not had no significant effect on host selection for the female adults. The choice of female adults on E.adenophorum was significantly higher than that of Artemisia carvifolia, Eichhornia crassipes and Salvia farinacea. The female adults preferred E.adenophorum in bloom or with mechanical damage. The selectivity of female adults decreased significantly if E.adenophorum plants were first exposed to Cd, Pb and Zn or a combination of them. 【Conclusion and significance】 The study showed selection behavior of P.utilis varied with plant species and development stage, health or level of contamination of the plants. This information can help establish a theoretical foundation for developing control mechanisms of E.adenophorum by using P.utilis.