Residual effect of lambdacyhalothrin on Triatoma infestans
Mem. Inst. Oswaldo Cruz
;
90(3): 415-419, May-Jun. 1995.
Article
in English
| LILACS
| ID: lil-319882
RESUMO
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.
Full text:
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Index:
LILACS (Americas)
Main subject:
Pyrethrins
/
Triatoma
/
Insecticides
Limits:
Animals
Country/Region as subject:
South America
/
Paraguay
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
1995
Type:
Article
Affiliation country:
Paraguay
Institution/Affiliation country:
Universidad Nacional de Asunción/PY
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