Efficacy of Insecticides to Aedes aegypti by thermal fogging in Loei and Nong Bua Lamphu province Year 2022

Abstract

The purpose of the study was to test the efficacy of the Insecticides on Aedes aegypti through quasi-experimental research. The testing involved a bioassay test conducted according to the World Health Organization's guidelines. Aedes aegypti larvae from Bora Bora, Loei, and Nong Bua Lam Phu species were cultured in the laboratory until they reached the adult stage. A total of 300 mosquitoes per species were assigned to the case group, while 75 mosquitoes per species were assigned to the control group. The test area was Loei province, and thermal fogging was used for the testing. The three chemical substances used in the study were pyrethroids: deltamethrin, cypermethrin, and zeta-cypermethrin, with concentrations of 0.5, 10, and 2.25 g/ha, respectively.

The results revealed that the Bora Bora species was highly susceptible to all pyrethroids, while the Loei species showed high susceptibility to cypermethrin, low susceptibility to deltamethrin, and moderate susceptibility to zeta-cypermethrin. The Nong Bua Lam Phu species was highly susceptible to cypermethrin, and moderately susceptible to deltamethrin and zeta-cypermethrin. The susceptibility of Ae. aegypti to pyrethroids varied in different areas. Therefore, it is important to use insecticides appropriate for specific areas and in the necessary quantities. This approach can help save budgets and protect the environment while minimizing insecticide resistance. Continuous monitoring should be conducted to gather information for the selection of appropriate insecticides.