Xie, Y.P., Liu, X., Li, J., & Tang, M. 1995 The effect of urban air pollution on populations of Eulecanium gigantea (Shinji) (Coccidae) in Taiyuan City, China.. Israel Journal of Entomology 29: 165-168.

Notes: The scale insect population on its host plant Sophora japonica is positively correlated with the number of cars driving in a specific district and can be used for monitoring air pollution in city streets.