TOXICITY OF NON-PYRETHROID INSECTICIDES AGAINST TRIATOMA INFESTANS (HEMIPTERA: REDUVIIDAE)

GUILLERMO CARVAJAL; GASTÓN MOUGABURE-CUETO ; ARIEL CEFERINO TOLOZA

MEMóRIAS DO INSTITUTO OSWALDO CRUZ.

FUNDACO OSWALDO CRUZ

Lugar: Rio de Janeiro; Año: 2012 vol. 107 p. 675 - 679

0074-0276

Triatoma infestans (Klug) is the main vector of Chagas disease which is a public health concern in most Latin American countries. Its prevention is based on the chemical control of the vector by the use of pyrethroid insecticides. In the last decade, different levels of deltamethrin resistance had been detected in certain areas of Argentina and Bolivia. Because of this, alternative non-pyrethroid insecticides of different chemical groups had been evaluated against two T. Infestans populations (NFS and El Malá), with the objective to find new insecticides to control resistant bug populations. Toxicity to different insecticides was evaluated in a susceptible and a deltamethrin-resistant population.  By topical application on first nymphs, the insecticides fenitrothion and imidacloprid had a lethal effect on both populations with LD50 values that ranged from 5.2 to 28ng/i. On the other hand, amitraz, flubendiamide, ivermectine, indoxacarb, and spinosad had no insecticidal activity on first instars for the applied doses (LD50 >200 ng/insect). Fenitrothion and imidacloprid were effective against susceptible and deltamethrin-resistant populations of T. Infestans.  Therefore, they can be considered alternative non-pyrethroid insecticides for Chagas control.