期刊论文详细信息
Memórias do Instituto Oswaldo Cruz
Residual effect of lambdacyhalothrin on Triatoma infestans
Esteban A. Ferro2  Antonieta Rojas De Arias2  M. Elena Ferreira2  Luis C. Simancas2  Luis S. Rios1  Jorge M. Rosner1 
[1] ,Universidad Nacional de Asunción Instituto de Investigaciones en Ciencias de la Salud Asunción,Paraguay
关键词: Triatoma infestans;    lambdacyhalothrin;    pyrethroids;    insect control;   
DOI  :  10.1590/S0074-02761995000300019
来源: SciELO
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【 摘 要 】

Insecticidal residual effect and triatomine infestation rates in houses of a community fumigated with lambdcyhalothrin (Icon) are reported. No mortality was observed in 5th-instar Triatoma infestans nymphs in 72-hr exposure test on three different surfaces, one month after fumigation for a dose of 31.5 mg am/m2. However, during post-exposure observation a mortality of 60% was recorded for those insect exposed on sprayed woodboard. The results observed with mud-containing treated walls, were markedly poorer (0% of mortality). Twelve month after spraying 40% of mortality was observed on first-instar T. infestans nymphs in 72-hr exposure test on woodboard, but lower mortality rates were observed in mud-containing materials. When the effect of deltamethrin (109 mg ai/m2) and lambdcyhalothrin (94 mg ai/m2) was compared, the former did not appear to be superior at similar loads. Both have showed a mortality rate of 30% on 5th-instar T. infestans nymphs three months post-fumigation. The dose utilized in the field fumigation was enough to get a significant (p < 0.0001) control of triatomine domestic infestation, since it was sufficient to keep 95% of the houses uninfested throughout 21 months following treatment, when compared with baseline situation. A remarkable knock-down effect on adult and nymphs forms of the insect and a high in situ mortality were observed as a result of its application, even at very low doses.

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