title: Insecticide susceptibility of Cnaphalocrocis medinalis (Lepidoptera: Pyralidae) in China.
abstract: Insecticide control is the major measure for suppression of Cnaphalocrocis medinalis (Guenée) (Lepidoptera: Pyralidae) damage, and a few insecticides used for long time have proved to fail to control this pest in China. Several new chemicals have been introduced for control of C. medinalis. However, there was no baseline susceptibility data of C. medinalis to insecticides used or will be in use. In this study, a seedling dipping method was developed for bioassay of insecticide susceptibility of C. medinalis. Dose responses of C. medinalis to 11 insecticides were tested. Interpopulation sensitivity to insecticides was compared. Based on LC50 values, C. medinalis was most susceptible to antibiotic insecticides (abamectin, emamectin benzoate, and spinosad) and least sensitive to monosultap and a Bacillus thuringiensis (Bt) product. Chlorantraniliprole and insect growth regulator (IGR) insecticides (tebufenozide and hexaflumuron) exhibited great efficacy against C. medinalis. No susceptibility difference was observed for antibiotic insecticide and IGR insecticides among three populations. Narrow variation in tolerant level was detected for organophosphates insecticides, chlorantraniliprole, monosultap, and Bt. The results in this study provided baseline susceptibility data of C. medinalis to 11 insecticides and also offered useful information for choice of alternative insecticide and for integrated resistance management of C. medinalis.
authors.affiliation: College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Xuesong
authors.initials: X
authors.lastname: Zheng
authors.forename: Xiubei
authors.initials: X
authors.lastname: Ren
authors.forename: Jianya
authors.initials: J
authors.lastname: Su
mesh_terms: D025041:Animal Migration; D000818:Animals; D002681:China; D007305:Insecticide Resistance; D007306:Insecticides / Q000494:pharmacology*; D007928:Lethal Dose 50; D009036:Moths / Q000187:drug effects*; D012621:Seasons
chemical_list: D007306:Insecticides