Pesticidal composition of thiacloprid and spinosad

The invention discloses a pesticidal composition of thiacloprid and spinosad which are taken as effective ingredients based on the mass ratio of 20:1 to 1:20. A laboratory test proves that a mixture of the spinosad and the thiacloprid shows additive effects based on the proportions of 1:5, 1:10, 1:20, 5:1, 10:1 and 20:1 respectively, and the mixed effect is better than a single spinosad pesticide and a single thiacloprid pesticide; and a field test proves that after the thiacloprid is mixed with the spinosad based on the proportion of 1:1 and the concentration of 2%, 10%, 20% and 40% respectively, the mixed effects are better than the single thiacloprid pesticide and the single spinosad pesticide. The mixture of the spinosad and the thiacloprid can prevent insects from generating drug resistance; and as the cost of the thiacloprid is low, the cost can be lowered on the premise of ensuring pesticide effect by means of composite application of the spinosad and the thiacloprid.