Field resistance of Spodoptera 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 of Spodoptera litura Fab. (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 LC50 values 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 for S. litura with special reference to management of field evolved resistance to insecticides.

Identification of soybean genotypes based on antixenosis and antibiosis to the armyworm (Spodoptera litura)

“…In Indonesia, armyworm has been reported resistant to insecticides of monocrotophos, endosulfan, decametrin, and metomil (Hadiyani 1995;Marwoto and Bedjo 1997). In Hunan province (China), S. litura was reported to have developed high resistance against a wide variety of insecticides including organophosphate, carbamate, and pyrethroids (Tong et al 2013). Hence, the use of insect-resistant crop variety is a valuable strategy in crop protection to reduce the negative effects of insecticides.…”

Potencial inseticida de plantas da família Annonaceae

“…Este grupo de lepidópteros é amplamente distribuído no mundo, e das 30 espécies descritas, metade é considerada praga de variadas culturas de importância econômica (POGUE, 2002). Mikolajczak et al (1998) (POGUE, 2002;SAITO et al, 2004;MAIRESSE, 2005;ÁLVAREZ et al, 2007;ROJANO et al, 2007;CAPINERA , 2008;BLESSING et al, 2010 (TONG et al, 2013).…”

Relationship of soil physical and chemical properties with ecological species groups in Pinus taeda plantation in northern Iran

“…So far, research on the role of trichome as one form of soybean resistance against pests has been more focusing on leaf-eating pests (Khan et al 1986;Hulburt et al 2004;Nobuyuki et al 2005;Komatsu et al 2010;Oki et al 2012;Tong et al 2013). This is based on the fact that economic losses due to leaf-eating pest infestations in the world soybean production centers were estimated to be higher than that due to the pod-feeders.…”