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Biologic Relative Fitness and Genetics of Indoxacarb Resistance in Spodoptera exigua(Hübner)

WANG Wei,GAO Ming,DENG Zhao-rong,LI Xiu-huan,MU Wei(College of Plant Protection,Shandong Agricultural University,Taian 271018,Shandong)  
【Objective】 The objective of this study is to determine the cross-resistance,relative fitness and resistance inheritance of the selected strain of Spodoptera exigua(Hübner) to indoxacarb in the laboratory.【Method】 The leaf-dip bioassay method was used for confirming the degrees of cross-resistance.The relative fitness was evaluated by constituting the life tables of different strains.The inheritance mode of resistance to indoxcarb in S.exigua was evaluated by using log dosage-probit mortality curves and statistical methods.【Result】 The 134-fold resistant strain(RR-indox) showed moderate level cross-resistance to emamectin benzoate(12.59-fold) and little or no cross-resistance to the other 7 insecticides tested.The RR-indox strain had a fitness value of 0.44 relative to the susceptible strain.The results indicated that the RR-indox strain possessed development and reproductive disadvantages.The values of dominance degrees(D) of the F1 progenies(F1,R♀×S♂,F?1,S♀×R♂) from the reciprocal cross were 0.54 and 0.74,respectively,which suggested that the resistance of indoxacarb in S.exigua was autosomal,incompletely dominant and probably polygenic.【Conclusion】 In order to delay the development of indoxacarb resistance in S.exigua,the insecticides with little or no cross-resistance could be rotated with indoxcarb in the field control.
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