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7 results on '"Meng, Fengxia"'

4. A Survey of Insecticide Resistance in Aedes albopictus (Diptera: Culicidae) During a 2014 Dengue Fever Outbreak in Guangzhou, China

Author

Yang ZhiCong, Meng FengXia, Li Chengling, Liu QiYong, Wang Yiguan, Liu Xin, Guo YuHong, Tianyun Su, Ren Dongsheng, and Jin Jianchao

Subjects
0106 biological sciences, 0301 basic medicine, Veterinary medicine, China, Insecticides, Aedes albopictus, Population, 01 natural sciences, Dengue fever, Cypermethrin, Dengue, Insecticide Resistance, 03 medical and health sciences, chemistry.chemical_compound, Aedes, parasitic diseases, medicine, Animals, education, education.field_of_study, Ecology, biology, fungi, Outbreak, General Medicine, Propoxur, medicine.disease, biology.organism_classification, 010602 entomology, 030104 developmental biology, Deltamethrin, chemistry, Insect Science, Larva, Female, Permethrin, medicine.drug
Abstract

A dengue fever outbreak in Guangzhou, Guangdong Province, China, in 2014 resulted in ∼37,000 cases and five deaths. Insecticides were sprayed to control the vector of this outbreak, Aedes albopictus (Skuse), a species of mosquito. Aedes albopictus specimens collected from Huadu District (HD), Huangpu District (HP), Luogang District (LG), and Nansha District (NS) in Guangzhou were evaluated using WHO-recommended bioassays for both larvae and adult mosquitoes to determine population resistance to deltamethrin, beta-cypermethrin, cypermethrin, permethrin, dichlorvos, temephos, propoxur, and DDT. Compared with a susceptible laboratory strain of Ae. albopictus (S-lab), all populations showed decreased sensitivities to the eight insecticides, with resistance ratios (RRs) ranging from 2.2 to 275. The RRs were 6.8–275 for pyrethroids, 2.2–4.4 for organophosphates, 5.7–9.0 for carbamates, and 5.3–94.3 for organochlorines. For adult mosquitoes, all populations were sensitive to dichlorvos with 100% mortalities. Mosquitoes from HP, LG, and NS were also sensitive to propoxur. But for other tested insecticides, different degrees of resistance (mortality rate ranging from 11.7% to 94.7%) were observed. Among the four field populations, the resistance levels are presented as follows in descending order: HP > HD > NS > LG. The levels among insecticides classes were pyrethroids > organochlorines > carbamates > organophosphates.

Published
2016

7. Diversity and frequencies of genetic mutations involved in insecticide resistance in field populations of the house fly (Musca domestica L.) from China

Author

Wang, Qingmin, Li, Mei, Pan, Jing, Di, Miaoci, Liu, Qiyong, Meng, Fengxia, Scott, Jeffrey G., and Qiu, Xinghui

Subjects
*GENETIC mutation, *HOUSEFLY insecticide resistance, *GENE frequency, *HOUSEFLY control, *DICHLORVOS, *DELTAMETHRIN, *INSECTICIDE resistance, *SINGLE nucleotide polymorphisms
Abstract

Abstract: Insecticides have been extensively used for house fly control in China, with dichlorvos and deltamethrin being widely used. Knowledge about the current status of insecticide resistance and the underlying genetic changes is crucial for developing effective fly control strategies. The susceptibility to dichlorvos and deltamethrin, and the frequencies of genetic mutations involved in insecticide resistance were studied in five field populations of the house fly collected across China. Bioassay results show that flies exhibit 14- to 28-fold resistance to dichlorvos and 41- to 94-fold resistance to deltamethrin, indicating that dichlorvos and deltamethrin resistance are common in house fly populations in China. Molecular analysis reveals that flies from the five various locations carry resistance alleles at multiple loci and have diverse allelic types, different relative frequencies and combinations of each allele. Four non-synonymous single nucleotide polymorphisms (SNPs) (i.e. V260L, G342A/V, F407Y) in acetylcholinesterase (Ace) and two mutations (W251L/S) in a carboxylesterase (MdαE7) were commonly present in the field house flies. The L1014H rather than L1014F mutation in the voltage sensitive sodium channel gene (Vssc) was widely distributed in Chinese house flies. CYP6D1v1, which confers pyrethroid resistance, was found in all the five tested populations in China, although its frequency in house fly from Shandong province was very low. Our results suggest that resistance monitoring and management of house flies should be customized for a given location. [Copyright &y& Elsevier]

Published
2012
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