Toxicity of a phenyl pyrazole insecticide, fipronil, to mosquito and chironomid midge larvae in the laboratory
Autor(es): Ali, A.; Nayar, J. K.; Gu, Wei-Dong
Resumo: Toxicity of a phenyl pyrazole insecticide, fipronil, to 4th-instar larvae of 6 species of colonized mosquitos (Aedes aegypti, Ae. albopictus, Ae. taeniorhynchus, Anopheles quadrimaculatus, Culex nigripalpus, and Cx. quinquefasciatus) and 2 species of field-collected chironomid midges (Chironomus crassicaudatus and Glyptotendipes paripes) was evaluated in the laboratory. All mosquito species were highly susceptible with 48-h median lethal concentration (LC sub(50)) values ranging from 0.00043 ppm (Ae. taeniorhynchus and An. quadrimaculatus) to 0.023 ppm (Ae. albopictus). Chironomus crassicaudatus and G. paripes also were extremely susceptible (48-h LC sub(50) of both species: 0.00042 ppm) to fipronil. Larval mortality checks of Ae. taeniorhynchus, Cx. nigripalpus, and G. paripes at 24 h and again at 48 h posttreatment revealed delayed activity of this compound against these species. First-instar larvae of Ae. albopictus and Cx. quinquefasciatus were significantly (P < 0.01) more susceptible to fipronil than the 4th-instar larvae of these mosquito species.
Palavras-Chave: Insecticides; Insect larvae; Chemical control; Larvae; Pest control; Toxicity tests; Fipronil; Laboratory bioassays; Larvicides; Culex; Chironomidae; Aedes; Chironomus crassicaudatus; Glyptotendipes paripes; Culicidae; Anopheles quadrimaculatus
Imprenta: Journal of the American Mosquito Control Association, v. 14, n. 2, p. 216-218, 1998.
Descritores: Aedes aegypti - Larvicide
Data de publicação: 1998
