[Residual effect of commercial applications of larvicides temefos and Bacillus thuringiensis israelensis on Aedes aegypti larvae in recipients with water renewal].
The residual effect of temefos (commercial applications A, B and C) and Bacillus thuringiensis israelensis (D and E) on Aedes aegypti larvae was evaluated, in recipients with water renewal. Forty-four beakers of 1,000ml each (8 for each application and 4 controls) were used. In each beaker, 25 larvae were introduced daily. After 24 hours, the dead larvae were counted, the beakers emptied to 200ml and refilled to original volume, with addition of new larvae. The duration of the maximum residual effect (100% of mortality) was: A-19; B-39; C-40; D-8; E-19 days. The mortality ratio of all applications remained equivalent for 25 days; B, C and E maintained MR equivalent up to 45 days; B and C showed MR 2.40 times greater than E, between 46-95 days; B, compared with A, showed MR 1.90-7.51 times greater between 26-95 days. The conclusion was greater effectiveness of two presentations of temefos, even in an epidemiological situation with long exposure to the product and renewal of water in recipients.
Pontes
Ricardo José Soares
RJ
Departamento de Saúde Comunitária, Faculdade de Medicina, Universidade Federal do Ceará, R. Prof Costa Mendes 1608/5 degree andar, Rodolfo Teófilo, 60431-970 Fortaleza, Ceará, Brazil. rjpontes@fortalnet.com.br
Regazzi
Ana Cláudia Ferreira
AC
Lima
José Wellington Oliveira
JW
Kerr-Pontes
Lígia Regina Sansígolo
LR
D000330:Aedes; D000818:Animals; D001413:Bacillus thuringiensis; D007814:Larva / Q000187:drug effects; D009032:Mosquito Control; D010573:Pesticide Residues / Q000494:pharmacology*; D000002:Temefos; D013997:Time Factors
D010573:Pesticide Residues; D000002:Temefos