Zhou, X., Tang, F.D., & Xie, Y.P. 2001 [Influence of air pollution on Comstocki mealybug's population in the Ginkgo and Fraxinus.]. Scientia Silvae Sinicae 37(4): 65-70.

Notes: Results are presented of a study conducted in Taiyuan, Shanxi, China to determine the effect of urban air pollutants (SO2 and Pb) on the population density of Pseudococcus comstocki on Ginkgo biloba and Fraxinus chinensis.