Influence of molting on efficacy of two functionally different larvicides: Bti and temephos
Autor(es): Jaric-Perkusic, D.; Hackenberger, B. K.; Stepic, S.; Merdic, E.
Resumo: The sensitivity of the second, third (L3) and fourth (L4) instars of Culex pipiens L. and Ochlerotatus sticticus (Meigen) to two larvicides, temephos and Bacillus thuringiensis variety israelensis (Bti) was tested with and without molting occurring in the experiments. In the first experiment for both tested mosquito species, LC50 values increased from the second to the fourth instar when tested against temephos, whereas for Bti the opposite trend was observed. The highest LC50 value was found for fourth instars of Cx.. pipens (0.00405 mg/liter) against temephos and for second instars of O-c. sticticus (0.267 mg/liter) against Bti. The determined LC50 values for the second and third instars of both species decreased with an increased number of molted larvae in the experiments with temephos. For the experiments with Bti molting did not have any significant influence oil LC50 values, except a small increase in toxicity during the L3/L4 molt of O-c. sticticus. These findings could help assess and define larviciding, its well its influence the quantity of larvicides needed for an efficient treatment.
Palavras-Chave: Culex; Ochlerolatus; Insecticide; Mosquito; Instar
Imprenta: Journal of Economic Entomology, v. 101, n. 4, p. 1204-1210, 2008
Identificador do objeto digital: 10.1603/0022-0493(2008)101[1204:IOMOEO]2.0.CO;2
Descritores: Aedes aegypti - Larvicide
Data de publicação: 2008
