›› 2010, Vol. 53 ›› Issue (9): 993-1000.

• RESEARCH PAPERS • Previous Articles     Next Articles

Susceptibilities of Lygus lucorum Meyer-Dür (Hemiptera: Miridae) from five cotton-growing regions in Shandong,China to selected insecticides

GUO Tian-E   

  • Online:2010-09-20 Published:2010-09-20

Abstract:

Susceptibilities of the green plant bug, Lygus lucorum Meyer-Dür collected from five cotton-growing regions in Shandong Province, China, to endosulfan, malathion, chlorpyrifos, bifenthrin, methomyl, carbosulfan, imidacloprid and fipronil, were determined by glass-vial bioassay in 2009 in order to choose efficient insecticides for controlling green plant bugs in different regions. Dose-response results indicated that L. lucorum from five cotton-growing regions were susceptible to malathion, chlorpyrifos, carbosulfan, bifenthrin and imidacloprid at LC50 values. Toxicity data indicated that L. lucorum collected in Liaocheng (LC) was more susceptible to methomyl, endosulfan and fipronil than those in other four regions. The results indicated that the LC50 values of Binzhou (BZ) population for methomyl, endosulfan and fipronil were 5.12-, 6.04- and 39.80-fold higher than those of LC population, respectively, and the LC50 values of Qufu (QF) population for methomyl, endosulfan and fipronil were 22.12-, 5.48- and 22.80-fold higher than those of LC population, respectively. The populations collected in BZ and QF was less susceptible to methomyl, endosulfan and fipronil. The toxicity sequence of 8 insecticides to L. lucorum was ranked as follows: fipronilmethomyl, bifenthrin, endosulfanmalathion, chlorpyrifoscarbosulfanimidacloprid. The susceptibilities of L. lucorum adults from Dezhou (DZ) to 8 insecticides were hardly changed during July and October in 2009. The current study may provide a better understanding of insecticide efficacies to L. lucorum and develop efficient pest management strategies in those cotton-growing regions.

Key words: Lygus lucorum, cotton, field population, resistance, insecticide susceptibility, insecticide, toxicity