The status of insecticide resistance in the beet armyworm, Spodoptera exigua

We summarized the status of resistance of beet armyworm, Spodoptera exigua (Hubner) to the insecticides commonly used in China. S. exigua developed high resistance to pyrethroid, organophosphorus and carbamate insecticides. One resistant strain of S. exigua from Tai'an region of Shandong Province, had 2 445.5-fold resistance to cyhalothrin. S. exigua developed low or medium level of resistance to bioinsecticides, for example, spinosad. Reduced susceptibility to insect growth regulator tebufenozide has been found, although insect growth regulator insecticide was still the favorable pesticide to control S. exigua. Cross resistance and resistance management were also reviewed in this paper.