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.

Identification of Four ATP-Binding Cassette Transporter Genes in Cnaphalocrocis medinalis and Their Expression in Response to Insecticide Treatment

“…Therefore, the fourth-instar larval midgut was selected as the target tissue for insecticide exposure. In previous studies, the organophosphate insecticide chlorpyrifos has been effectively used for the control of a wide range of pests, including Chilo suppressalis , planthoppers and C. medinalis (Zheng et al 2011, Zhang et al 2014). The expression of the four genes was compared between chlorpyrifos-treated and untreated control insects.…”

High Levels of Resistance to Chlorantraniliprole Evolved in Field Populations of <I>Plutella xylostella</I>

“…Narrow variations in chlorantraniliprole susceptibility (based on LC 50 ) were observed in Þeld populations of P. xylostella (Þvefold) (Wang et al 2010), Choristoneura rosaceana (5.3-fold) (Sial et al 2010), Cnaphalocrocis medinalis (5.8-fold) (Zheng et al 2011), Chilo suppressalis (9.4-fold) (Huang et al 2011), Spodoptera exigua (sixfold) , and Bemisia tabaci (Þvefold) (Li et al 2012). Limited variation of chlorantraniliprole susceptibility in pest Þeld populations suggested that there is no cross-resistance to chlorantraniliprole conferred by resistance to currently used insecticides (Wang et al 2010, Li et al 2012.…”

Status of Insecticide Resistance of the Whitebacked Planthopper,Sogatella furcifera(Hemiptera: Delphacidae)

“…Chlorpyrifos was the main insecticide for control of Asiatic rice stem borer (Chilo suppressalis [Walker]; Crambidae) and rice leaf-folder (Cnaphalocrocis medinalis [Guinée]; Crambidae) in China for yr (He et al 2008;Zheng et al 2011), and was also intensively used to control the rice planthopper. Fukuda & Nagata (1969) reported great differences in susceptibility to organophosphorus insecticides among geographic populations of WBPH.…”