【摘 要】
：
Spodoptera frugiperda(Lepidoptera:Noctuidae)is a widely distributed pest of corn.Since it invaded China in 2018,it has caused serious damage to local corn produc-tion.Chlorantraniliprole,an anthranilic diamide insecticide,has been widely used to con-trol
【机 构】
：
College of Plant Protection,China Agricultural University,Beijing,China
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Spodoptera frugiperda(Lepidoptera:Noctuidae)is a widely distributed pest of corn.Since it invaded China in 2018,it has caused serious damage to local corn produc-tion.Chlorantraniliprole,an anthranilic diamide insecticide,has been widely used to con-trol lepidopteran pests.Tetrachloropyramid is a new allosteric modulator insecticide devel-oped based on chlorantraniliprole,so it has a similar mechanism and insecticidal effect.In this study,we investigated resistance levels to chlorantraniliprole and tetrachloropyramid in S.frugiperda from 13 populations in China.Among the populations tested,the rela-tive highest resistance to chlorantraniliprole occurred in the Guangzhou population,and the most susceptible to chlorantraniliprole was found in the Wuhan population.The lethal dosage LD50 value of the Guangzhou population against chlorantraniliprole was 27.8-fold higher than that of the Wuhan population.Minimal differences were observed among S.frugiperda populations in terms of sensitivity to tetrachloropyramid.Heterozygous mu-tations at the I4734 site of the ryanodine receptor(RyR)were found,while no mutations were found in the G4891 site.The mutations were detected in only two of the 786 indi-viduals analyzed,one from the Qinzhou population and other from the Anshun population(frequency below 2％in both cases).There were no significant differences in the expres-sion levels of RyR between Guangzhou and Wuhan populations.In summary,our results indicate that:(i)S.frugiperda has low resistance levels to diamide insecticides in China;and(ii)the differences in relative resistance among the 13 populations analyzed are not caused by the mutations in RyR or the expression of RyR.
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