Population structure and individual body weight of overwintering populations of Chilo suppressalis collected at 20 locations in China from September 2010 to February 2011 were compared. And the mutations associated with resistance to triazophos, an organophosphate insecticide, among these populations was also analysed by restriction fragment length polymorphism PCR (RFLPPCR). Results showed that the 6th instar larva was the predominant in 18 of 20 populations, and the composition of the overwintering populations didn′t vary with geographic locations, with the 4th, 5th or 6th instar larvae accounting for more than 90 percents of the overwintering individuals. Besides that, results also showed that the mutation frequencies associated with triazophos resistance differed among geographical populations, which closely related with the occurrence of the pest. In regions where C. suppressalis occurred frequently and severely, such as Zhejiang, Fujian Province and so on, high mutation frequencies were observed (ranged from 31.3% to 100%), while in other regions where C. suppressalis occurred infrequently, such as Funan，Anhui Province, Deyang，Sichuan Province, the mutation freqencies were relatively low (ranged from 0% to 23%).
LUO Guanghua1 , ZHANG Zhichun1 , HAN Guangjie1 , HAN Zhaojun2 , FANG Jichao1, *
. Characteristics of Overwintering Populations of Rice Stem Borers and Mutation Frequencies of Resistance to Triazophos[J]. Chinese Journal OF Rice Science, 2012
, 26(4)
: 481
-486
.
DOI: 10.3969/j.issn.10017216.2012.04.014
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