“…If their survivors manage to feed at this stage, 50% of them will pass on to the adult phase and will survive long enough to reproduce (10% of the adults can survive up to 160 days). Lima et al (1991) tested experimentally the toxicity of several synthetic insecticides (hexachlorocyclohexane, DDT, triclorfon, malathion, cypermetrin, deltametrin and permetrin). She added them to the food intake of six triatomine species (Panstrongylus megistus, T. infestans, T. pseudomaculata, T. vitticeps, T. brasiliensis and Rhodnius prolixus) and, among all these species, T. vitticeps demonstrated the largest level of resistance to any tested insecticide, except for HCH in concentration of 1 g/l, in spite of the fact that T. vitticeps is not a household species.…”