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Poster Session

Adult Control

Poster Session

P-7 - SUSCEPTIBILITY TO TEMEPHOS AND MALATHION INSECTICIDES OF AEDES AEGYPTI (DIPTERA: CULICIDAE) POPULATIONS IN THE STATE OF SÃO PAULO, BRAZIL

Wednesday, March 5, 2025
12:15 PM – 1:45 PM AST
Location: Hall A
Abstract: The monitoring of the insecticide susceptibility of Ae. aegypti in the state of São Paulo (SP) has been carried out since 2000 for insecticides of the organophosphate class, a larvicide, temephos and an adulticide, malathion. The analysis of the historical series of both insecticides is presented, the management by other insecticide classes and the results after this management are discussed. Populations of Ae. aegypti from all regions of the SP were followed for larvicide monitoring from 2000 to 2022 and adulticide from 2003 to 2022. All populations tested for the larvicide in the period from 2000 to 2002 were susceptible. From 2003 to 2010, there was an increase in populations with reduced susceptibility and, from the interruption of the use of this insecticide in 2007, by insecticide of the class of insect development regulators, there was a reversal process from 2011 and in 2022, all populations tested were classified as susceptible. The adulticide malathion began to be used effectively in 2001 in the SP and monitoring began in 2003, when all populations were classified as susceptible, except for the population of São Sebastião, which showed reduced susceptibility. As of 2019, another 9 populations began to show changes in susceptibility and, in 2020, this insecticide was replaced by an insecticide composed of a mixture of two classes of pesticides, a neonicotinoid and a pyrethroid. In 2022, 66.7% of the populations tested had decreased susceptibility to the organophosphate. With the analysis of the historical series of both insecticides, it is possible to verify the change in susceptibility, as well as to follow the differences in responses between the analyzed regions that have climate and different pressures of insecticides exerted by repeated applications due to local epidemics. Susceptibility monitoring is an important tool for establishing the opportune moment for insecticide class management.