A near isogenic line strain(NILs)was selected by repeated back crossing.Two NILs of dimehypo-resistance(Rd)and cartap-resistance(Rp)were selected by 12 generations back crossing.

• 通过12代回交，建立了抗杀虫双和抗杀螟丹近等基因系，并对其多功能氧化酶环氧化活性和生物学特性进行了比较研究。