Study on Control Effect of 0.3% Soluble Matrine etc New Pesticides on Cotton Aphid in North Xinjiang

[Objective] The aim was to study the control effect of matrine on cotton aphid.[Method] With cotton variety Xinluzao33 as the tested crop,the control effects of 0.3% matrine,25% Actara WG,0.5% acetamiprid(control pesticides) and 40% omethoate on cotton aphid were studied.[Result] After 3,7,15 d of pesticides application,the decresae rates of cotton aphid treated by 0.5% acetamiprid,0.3% matrine and 25% Actara WG were 94.5%,97.1%,85.4% and 90.8%,91.5%,87.7% and 91.6%,93.5%,85.4% resp.,and their correction control effect on cotton aphid were 95%,99.5%,96.9% and 91.2%,91.5%,98.9% and 92.0%,96.7%,96.7%,the control effect of 40% omethoate on cotton aphid was worse.The correction control effect of matrine and Actara on cotton aphid were lower than that of control pesticides after 3,7 d of pesticides application,but after15 d of pesticides application,the correction control effect of matrine on cotton aphid was higher than that of control pesticides,and that of Actara was equal with that of control pesticides.[Conclusion] When biological pesticide matrine was used to control cotton aphid,the effect was slower,but the persistent period of it was longer with less environmental pollution.