|HE, YUE PING|
|CAO, MING ZHANG|
|GAO, CONG FEN|
|CHEN, WEN MING|
|HUANG, LI QIN|
|ZHOU, WEI JUN|
|LIU, XU GAN|
|SHEN, JIN LIANG|
|Zhu, Yu Cheng|
Submitted to: Journal of Economic Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/1/2007
Publication Date: 12/6/2007
Citation: He, Y., Cao, M., Gao, C., Chen, W., Huang, L., Zhou, W., Liu, X., Shen, J., Zhu, Y. 2007. Survey of Susceptibilites to Monosultap, Triazophos, Fipronil, and Abamectin in Chilo suppressalis (Lepidoptera: Crambidae). Journal of Economic Entomology.100:1854-1861.
Interpretive Summary: Due to the high toxicity to high animals and environment, many pesticides, including methamidophos, parathion, methyl-parathion, monocrotophos and phosphamidon once being major insecticides for rice insect control, are subjected to be phased out entirely in 2007. Monosultap, triazophos, fipronil, and abamectin may potentially become the major chemicals to control the rice stem borer. To provide a foundation for area-wide resistance management of rice stem borer, we initiated a five-year study to investigate spatial and temporal changes in susceptibilities to monosultap, triazophos, fipronil and abamectin, to monitor the dynamics of resistance to long-time used insecticides such as monosultap and triazophos, and to monitor potential resistance development to newly introduced insecticides, fipronil and abamectin. Results showed that resistance levels were associated with the history and intensity of insecticide application. Therefore, chemical control plans and resistance management strategies must be developed accordingly based on chemical control history to fit each rice-growing region.
Technical Abstract: To provide a foundation for national resistance management of the rice stem borer, Chilo suppressalis (Walker), a systematic study was carried out to determine dose response and susceptibility changes over a five-year period in the insect from representative rice production regions. A total of eleven populations were collected from 2002 to 2006 in seven rice growing provinces in China and 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 area of southeast Zhejiang, were highly or extremely highly resistant to triazophos, and some populations in Anhui, Jiangsu, Shanghai and the northern rice regions, were susceptible or had low level resistance to triazophos. Results also showed that most field populations were susceptible to fipronil, but the populations from Ruian and Cangnan, Zhejiang in 2006 showed moderate levels of resistance to fipronil. All 11 field populations collected in 2002~2006 were susceptible to abamectin. The tolerance levels in the rice stem borer exhibited an increasing trend (or with fluctuation) over a five-year period for different insecticides, and 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 force for the resistance evolution in C. suppressalis. Strategic development of insecticide resistance management was also proposed.