title: Field resistance ofSpodoptera litura(Lepidoptera: Noctuidae) to organophosphates, pyrethroids, carbamates and four newer chemistry insecticides in Hunan, China.
abstract: The present studies were carried out to evaluate resistance in the populations ofSpodoptera lituraFab. (Lepidoptera, Noctuidae) from five districts of Hunan Province in China to various insecticides from 2010 to 2012 using a standard leaf dip bioassay method. For organophosphates and pyrethroids, resistance ratios compared with a susceptible Lab-BJ strain were in the range of 14-229-fold for organophosphates and 12-227-fold for pyrethroids. Similarly, relative low levels of resistance to emamectin, indoxacarb, and chlorfenapyr were observed in all five populations. In contrast, the resistance to carbamates (thiodicarb or methomyl) was significantly higher than that of organophosphates, pyrethroids and newer chemistry insecticides. The pairwise correlation coefficients of LC50values indicated that the newer chemistry insecticides and old generation insecticides were not significant except abamectin, which was negatively significantly correlated with methomyl. A significant correlation was observed between thiodicarb, methomyl, and deltamethrin, whereas resistance to bifenthrin showed no correlations with resistance to other insecticides except deltamethrin. The results are discussed in relation to integrated pest management forS. liturawith special reference to management of field evolved resistance to insecticides.
authors: Institute of Pesticide Science, Hunan Agricultural University, Changsha, 410128 People's Republic of China.
authors: Hong
authors: H
authors: Tong
authors: Qi
authors: Q
authors: Su
authors: Xiaomao
authors: X
authors: Zhou
authors: Lianyang
authors: L
authors: Bai
keywords: Abamectin; Chlorfenapyr; Cross-resistance; Cutworm; Emamectin benzoate; Indoxacarb; Resistance evolution
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