P 27 - Lethal doses of insecticides used in vector control programs against Triatoma dimidiate (Hemiptera: Reduviidae) using impregnated papers.
Wednesday, March 6, 2024
12:15pm – 1:15pm
Location: The Grand Hall
Abstract: Triatoma dimidiata (T. dimidata) is the main vector of Chagas disease in South Mexico. The use of insecticides has been the most effective strategy for vector control in Latin America and it is necessary to have doses and methods for monitoring susceptibility to insecticides commonly used to control T. dimidiata populations. We calculated the lethal doses (LD50 and LD99) of three active ingredients (deltamethrin, bendiocarb and pirimiphos-methyl) in nymphs I and V of T. dimidiata population 5 generations isolated and reared under insectary conditions. The LD50 and LD99 were obtained by PROBIT analysis. Lethal doses of deltamethrin, bendiocarb and pirimiphos-methyl against T. dimidita (nynphs I) were as follows: LD50= 2.8, 26.62, 2.75 µg/cm²; LD99= 24.90, 65.23, 4.36 µg/cm² respectively, while for nymphs V: DL50= 41.79, 19.83, 6.00 µg/cm²; LD99= 237.69, 72.23, 16.74 µg/cm². The values of LD50 and LD99 obtained could be considered for monitoring the susceptibility of populations of T. dimidiata to these active ingredients under operational conditions.
