Control effect of several pesticides on Tetranychus urticae Koch

Seven pesticides, 10% abamectin·pyridaben EC, 1.2% abamectin·alphamethrin EC, 1.8% abamectin EC, 10% pyridaben EC, 0.6% azadirachtin·matrine EC, 2.5% beta-cypermethrin and 40% isocarbophos were applied to against Tetranychus urticae Koch. The results indicated that five treatments got the best effects after 7 days, 98.2%, 95.8%, 92.9%, 93.4%, 89.8% which corresponded to 10% abamectin·pyridaben EC 40mg/L, 1.2% abamectin· alphamethrin EC 4.8mg/L, 1.8% abamectin EC 4.5mg/L, 10% pyridaben EC 40mg/L, 0.6% azadirachtin·matrine EC 6mg/L respectively. And the effects were 98.2%, 95.8%, 92.9%, 93.4%, 89.8% after 20 days. The above five pesticides can be generalized on practice for its good quickly available, long period of validity and high effects.