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通过结合在烟草种植时施用基肥而采用农药呋喃丹和铁灭克的根区施药方法，研究农药对烟草蚜虫及其天敌种群数量的影响。研究结果表明，采用根区施药的方法可以有效地防治烟蚜，也有效地保护了其天敌烟蚜茧蜂。从烟草种植后的两个月内，呋喃丹和铁灭克处理的烟蚜的平均种群密度（头／株）分别为９．６和１０．７，显著地低于对照（６２．１）；而呋喃丹和铁灭克处理的烟蚜茧蜂的平均种群密度分别为５．５和４．６，与对照（１１．９）比较差异不显著。同时减少了施用农药的次数
The effects of pesticides on the populations of tobacco aphids and their natural enemies were studied by combining the application of base fertilizer with tobacco carbofuran and fermex in the tobacco planting. The results showed that the root zone pesticide application method can effectively control the tobacco aphid, but also effectively protect the natural enemies of the tobacco aphid Braconidae. The average population density (head / plant) of the fenvalerate treated with carbofuran and fermectin was 9.6 and 10.7, respectively, significantly lower than that of the control (62.1) during the two months after tobacco planting. The mean population density of A. calyciflorus treated with carbofuran and fermectin was 5.5 and 4.6, respectively, which was not significantly different from that of control (11.9). While reducing the number of pesticides applied