| Aphid is one kind of destructive pest in agricultural production. For a long time, the prevention and control of aphids has been mainly depended on chemical pesticide. Nowadays, with the increasing consciousness of people's environmental protection, eco-friendly and selective new-style botanical pesticide attracts more and more attention.In order to find out a more effective formula of botanical pesticide, we commence the following research. Firstly, three special medicinal plants ethanol extracts which could eliminate aphids obviously were selected by indoor bioassay out of the nine kinds of extracts. Moreover, the three kinds of medicinal plant extracts were combined and the results showed respectively that the combination of A+G had coordinate synergism to aphid by qualitative analysis of co-toxicity coefficient. Thus, the optimum ratio of combination A/G is 2 : 1 by quantitative determination of co-toxicity factor. Then, a series of different inert ingredient were put in medicinal plants ethanol extracts combination by orthogonal design.Meanwile, a regression equation was used for regression analysis. The study showed that the seventh group had best performance for aphid control, so we got the formula of botanical aphicide X and proportion of its ingredient. At last, the experiment for the effects of botanical aphicide X on pest control in field plots was carried out as well. The results indicated that botanical aphicide X had equal or even better effects on prevention of aphids to common pesticide such as flolimat and matrine.
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