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１９９３～１９９５年对太原市园林蚧虫的天敌昆虫作了调查研究，获得天敌昆虫标本３００多号，查明主要种类有２０余种，分属于６目１０科。观察了天敌昆虫的生物学习性，比较了城市不同污染区天敌的种类和密度，证明了城市污染使天敌昆虫的种群数量减少和蚧虫控制能力降低，是城市蚧虫增长的重要原因。讨论了对污染敏感的天敌是一些暴露活动的捕食性种类，隐蔽性的寄生性天敌对污染抗性较强。同时提出了用天敌昆虫作为城市污染生物监测因子的可能性和方法。
From 1993 to 1995, the natural enemies of garden scale insects in Taiyuan City were investigated. More than 300 natural enemy insect specimens were obtained. More than 20 species of main species were identified, belonging to 6 orders and 10 families. The biological characteristics of natural enemy insects were observed. The species and density of natural enemies in different polluted areas of cities were compared. It was proved that urban pollution reduced the populations of natural enemies and the control ability of scale insects. It is discussed that some natural enemies that are sensitive to pollution are some predatory species that are exposed to the activity, and the concealed parasitic natural enemies are more resistant to the pollution. At the same time, the possibility and method of using natural enemy insects as bio-monitoring factors of urban pollution were proposed.