Survey of susceptibilities to monosultap, triazophos, fipronil, and abamectin in Chilo suppressalis (Lepidoptera: Crambidae).
To provide a foundation for national resistance management of the Asiatic rice borer, Chilo suppressalis (Walker) (Lepidoptera: Crambidae), a study was carried out to determine dose-response and susceptibility changes over a 5-yr period in the insect from representative rice, Oryza sativa L., production regions. In total, 11 populations were collected from 2002 to 2006 in seven rice-growing provinces in China, and they were used to examine their susceptibility levels to monosultap, triazophos, fipronil, and abamectin. Results indicated that most populations had increased tolerance to monosultap. Several field populations, especially those in the southeastern Zhejiang Province, were highly or extremely highly resistant to triazophos (resistance ratio [RR] = 52.57-899.93-fold), and some populations in Anhui, Jiangsu, Shanghai, and the northern rice regions were susceptible or had a low level of resistance to triazophos (RR = 1.00-10.69). Results also showed that most field populations were susceptible to fipronil (RR < 3), but the populations from Ruian and Cangnan, Zhejiang, in 2006 showed moderate levels of resistance to fipronil (RR = 20.99-25.35). All 11 field populations collected in 2002-2006 were susceptible to abamectin (RR < 5). The tolerance levels in the rice stem borer exhibited an increasing trend (or with fluctuation) over a 5-yr period for different insecticides, and they reached a maximal level in 2006 for all four insecticides. Analysis of regional resistance ratios indicated that the history and intensity of insecticide application are the major driving forces for the resistance evolution in C. suppressalis. Strategic development of insecticide resistance management also is proposed.
He
Yue Ping
YP
Department of Pesticide Science, College of Plant Protection, Nanjing Agriculture University, Nanjing, 210095, China.
Gao
Cong Fen
CF
Cao
Ming Zhang
MZ
Chen
Wen Ming
WM
Huang
Li Qin
LQ
Zhou
Wei Jun
WJ
Liu
Xu Gan
XG
Shen
Jin Liang
JL
Zhu
Yu Cheng
YC
D000818:Animals; D002681:China; D003710:Demography; D004305:Dose-Response Relationship, Drug; D007305:Insecticide Resistance; D007306:Insecticides / Q000494:pharmacology*; D007559:Ivermectin / Q000031:analogs & derivatives / Q000494:pharmacology; D009036:Moths / Q000187:drug effects*; D063086:Organothiophosphates / Q000494:pharmacology; D011720:Pyrazoles / Q000494:pharmacology; D013997:Time Factors; D014230:Triazoles / Q000494:pharmacology
D007306:Insecticides; D063086:Organothiophosphates; D011720:Pyrazoles; D014230:Triazoles; C048324:abamectin; C012584:triazophos; D007559:Ivermectin; C082360:fipronil