Lethal effect of a bait for Rhodnius prolixus (Hemiptera: Reduviidae), the vector of Chagas' disease, containing hexachlorocyclohexane (HCH), under laboratory conditions

Authors

  • Marli Maria Lima FIOCRUZ; Instituto Oswaldo Cruz; Departamento de Biologia
  • Luis Rey FIOCRUZ; Instituto Oswaldo Cruz; Departamento de Medicina Tropical
  • Rubens Pinto de Mello FIOCRUZ; Instituto Oswaldo Cruz; Departamento de Entomologia

Keywords:

Trypanosomiasis, Triatomines, Rhodnius prolixus, Insecticide, Hexachlorocyclohexane, Lethality rate, Insect control

Abstract

The lethal effect of a bait containing an aqueous hexachlorocyclohexane (HCH) suspension at the concentration of 1g/l and maintained at room temperature was studied in the laboratory over a period of 12 weeks. The suspension was placed in a latex bag hanging inside a 1000-ml beaker tightly covered with nylon netting, and left there with no changes for 85 days. Sixteen groups of R. prolixas bugs, consisting on average of 30 specimens each, were successively exposed to the bait and observed at different intervals for one week each. The mortality rate was 100% for all groups, except for the 16th, whose mortality rate was 96.7%. As the groups succeeded one another, mortality started to occur more rapidly and was more marked at the 6- and 24-h intervals. Later tests respectively started at 6:00 a.m. and 6:00 p.m. showed that diurnal and nocturnal periodicity in the offer of food had no effect on mortality. First- and 2nd- instar nymphs and adults male were more sensitive and 5th- instar nymphs were more resistant to the active principle of the bait.

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Published

1992-08-01

Issue

Section

Original Article

How to Cite

Lima, M. M., Rey, L., & Mello, R. P. de. (1992). Lethal effect of a bait for Rhodnius prolixus (Hemiptera: Reduviidae), the vector of Chagas’ disease, containing hexachlorocyclohexane (HCH), under laboratory conditions . Revista Do Instituto De Medicina Tropical De São Paulo, 34(4), 295-301. https://revistas.usp.br/rimtsp/article/view/28936