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Notes: The results of this resesarch indicate that urban environmental pollution causes the epidemic of scale pests in Taiyuan City. The important species are Eulecanium gigantea, E. kuwanai, Quadraspidiotus gigas, Lepidosaphes salicina, Pseudaulacaspis pentagona, Phenacoccus fraxinus, Pseudococcus maritimus and P. comstocki.