Biomaterial Database

Resistance to deltamethrin in Culex pipiens pallens (Diptera: Culicidae) from Zhejiang, China. 1999

W Jinfu

College of Life Sciences, Hangzhou University, Zhejiang, People's Republic of China.

Resistance to deltamethrin, a pyrethroid insecticide, was found in 7 Culex pipiens pallens L. populations collected in Zhejiang (southeast China). Larval populations exhibited resistance ratios of 5.9-24.73 at LC50 and of 95.8-294.5 at LC95. Mortality ratios between field-collected adults and susceptible laboratory adults exposed to the discriminating dosage (0.01%/20 min) were 44.7-87.3. Resistance levels varied among populations as follows: Wenzhou > Ningbo > Hangzhou > Zhoushan > Jiaxing > Jinhua > Taizhou. Heavy use of pyrethroid insecticides for controlling mosquitoes in some areas has increased pyrethroid resistance in their regional populations. After selecting larvae from each population with deltamethrin for 12-15 generations, the resistance ratio increased by 103.3-342.5 at LC50 and by 79.7-203.1 at LC95. These results indicated that a large-scale Cx. p. pallens control with pyrethroid insecticides would induce a further increase of pyrethroid resistance in Zhejiang.

UI	MeSH Term	Description	Entries
D007305	Insecticide Resistance	The development by insects of resistance to insecticides.	Insecticide Resistances,Resistance, Insecticide,Resistances, Insecticide
D007306	Insecticides	Pesticides designed to control insects that are harmful to man. The insects may be directly harmful, as those acting as disease vectors, or indirectly harmful, as destroyers of crops, food products, or textile fabrics.	Insecticide
D009570	Nitriles	Organic compounds containing the -CN radical. The concept is distinguished from CYANIDES, which denotes inorganic salts of HYDROGEN CYANIDE.	Nitrile
D011722	Pyrethrins	The active insecticidal constituent of CHRYSANTHEMUM CINERARIIFOLIUM flowers. Pyrethrin I is the pyretholone ester of chrysanthemummonocarboxylic acid and pyrethrin II is the pyretholone ester of chrysanthemumdicarboxylic acid monomethyl ester.	Pyrethrin,Pyrethroid,Pyrethroids
D002681	China	A country spanning from central Asia to the Pacific Ocean.	Inner Mongolia,Manchuria,People's Republic of China,Sinkiang,Mainland China
D003465	Culex	A genus of mosquitoes (CULICIDAE) commonly found in tropical regions. Species of this genus are vectors for ST. LOUIS ENCEPHALITIS as well as many other diseases of man and domestic and wild animals.	Culices
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia