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从研究油菜蚜虫种群生态位出发，探讨了田间混合蚜群的竞争共存机制，并将生态位理论应用于天敌控制效应的定量评估上。结果表明，随着时间的变化，甘兰蚜和萝卜蚜的激烈竞争主要集中表现在空间上的分化，田间群体状况表现出高度聚集特性；而桃蚜的空间分化并不明显，主要是累积为害。无敌的时间及空间跟随效应与控制潜能差异较大，以食蚜绒螨对桃蚜、蝇幼类对甘兰蚜和萝卜蚜的控制效应最高。
Based on the study of the niche of rape aphid population, the competitive coexistence mechanism of mixed aphid population in field was discussed, and the niche theory was applied to the quantitative evaluation of natural enemy control effect. The results showed that with the change of time, the intense competition of A. lanuginosa and A. radici mainly focused on the spatial differentiation, and the field population showed a high degree of aggregation. However, the spatial differentiation of M. persicae was not obvious, mainly accumulated . Invincible time and space follow-up effect and control potential difference is larger, with the food aphid mites on peach aphid, fly juvenile cabbage aphid and radish aphid control effect highest.