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多年多点的研究结果表明，在苹果单株产量为１０８．１９～１５４．２０ｋｇ，苹果绵蚜发生个体群密度３０～１５０／株的情况下，个体群密度与产量之间呈负相关，相关关系达极显著水平，小国光和青香蕉品种的直线回归方程分别为ｙ小国光＝１６１．７７４０－０．００４４９ｘ和ｙ青香蕉＝１０８．３４８０－０．００２０８ｘ。根据苹果绵蚜个体群密度与产量损失率之间的关系，建立了苹果绵蚜的经济防除阈值模型。
The results of multi-year study showed that there was a negative correlation between individual population density and yield under the condition of 108.19-14.4.20 kg of apple per plant and 30-150 individuals per plant of cotton aphid The relationship was significant. The linear regression equations of Xiao Guoguang and Qing banana were y = Guotouguang = 161.7740-0.00449x and y = + = Banquet = 108.3480-0.00208x respectively. According to the relationship between individual population density of apple aphid and the rate of yield loss, the threshold model of economic control of apple aphid was established.