Evaluation of the residual effect of temephos on Aedes aegypti (Diptera, Culicidae) larvae in artificial containers in Manaus, Amazonas State, Brazil.
Trial tests and container observations were conducted in households to verify the residual effect of temephos in Manaus, Amazonas State, Brazil. Three plastic buckets, three tin cans, and three tires filled with water from an artesian well and larvicide were used in the experiment, with twenty-five third-instar larvae, which remained exposed for 24h, followed by mortality readings. The same types of containers were selected from common households. Collection and counts followed by chemical treatment were carried out on the larvae that were found. Follow-up was performed weekly to verify recolonization by Aedes aegypti. The experiment showed 100% mortality in the plastic buckets until day 90, and 80% in the tin cans until day 30, decreasing from day 45 onwards. Mortality in the tires decreased to 35% in the first month. Household results showed 100% mortality for all containers after 24h and differentiated values in the subsequent readings. Larvae were observed on day 35 in a tin can and on day 21 in a gallon can. There was a large diversity of results in the tires, with recolonization observed from day 7 onwards.
Pinheiro
Valéria Cristina Soares
VC
Departamento de Química e Biologia, Centro de Estudos Superiores de Caxias, Universidade Estadual do Maranhão, Caxias, MA 65604-370, Brasil. valeria@inpa.gov.br
Tadei
Wanderli Pedro
WP
D000330:Aedes / Q000187:drug effects*; D000818:Animals; D001938:Brazil; D003715:Dengue / Q000517:prevention & control; D004197:Disease Reservoirs; D006863:Hydrogen-Ion Concentration; D007306:Insecticides; D007814:Larva / Q000187:drug effects; D009032:Mosquito Control / Q000379:methods*; D010573:Pesticide Residues; D011679:Pupa / Q000187:drug effects; D000002:Temefos; D013696:Temperature; D013997:Time Factors
D007306:Insecticides; D010573:Pesticide Residues; D000002:Temefos