The present invention relates to a bionic low-toxic composite pesticide. It is formed from two active components of chlorfluazuron and monosultap (or bisultap) and adjuvant, filler or solvent. By pure dosage for every mu said composite pesticide contains 0.1-5 g of chlorfluazuron and 5-75g of monosultap (or bisultap). Said composite pesticide can obviously raise the effect for controlling rice leaf roller, also can be used for controlling rice borers, and can be substituted for high-toxic pesticide. |