Abstract: The host selection and oviposition choice behavior of Micromelalopha sieversi (Staudinger) among five Populus deltoids clones were observed by observation, and the host volatile extract were prepared for the purpose of comparing the differences in host selectivity, analyzing the impact of volatile substances on the moth host selection. The results showed that there were different host selection rates of different gender and physiological state moths. The females showed differences in host selectivity, while the males did not. There were more mated female moths made host choices than the virgin moths. The statistical results of host oviposition selectivity suggested that Biyu had the strongest oviposition attractant activity, followed by Populus×canadenesis ‘Guariento’, but there were no significant differences among the other treatments and controls.