Evaluation of Insecticides Against Aedes Aegypti (L.) and Culex Pipiens Quinquefasciatus Say (Diptera: Culicidae) in Bangkok, Thailand
WALTER REED ARMY INST OF RESEARCH WASHINGTON DC
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The two species of mosquitoes of primary concern in Bangkok, Thailand are Aedes aegypti L. and Culex pipiens quinquefasciatus Say fatigans Wiedemann. Aedes aegypti is the vector of dengue and the related viral disease, Thai hemorrhagic fever. It breeds profusely in the concrete jugs ong nam or Shanghai jars used for water storage throughout the area. Culex p. quinquefasciatus is not known to transmit filariasis or any other diseases in Bangkok, but the species is the most abundant in the area and is a problem. It breeds in great numbers in many of the canals and ditches klongs which occur in all sections of Bangkok. Homes are built over and adjacent to these ditches, and the occupants throw most of their garbage into the water. Since this water is stagnant during the dry and premonsoon season, it becomes foul and makes an ideal situation for breeding. No organized effort is made to control mosquitoes in the city however, during outbreaks of Thai hemorrhagic fever, perifocal treatments with DDT are used -that is, the inside of houses is fogged, and a residual spray is applied to all breeding areas. DDT and dieldrin are readily available for anyone who wishes to purchase them for mosquito control or other purposes. On several occasions, we saw DDT being applied as a fuel oil fog with a Swingfog Pulse Jet Fogger registered trademark in movie theaters and schools. During the summer of 1965, we had an opportunity to test the effectiveness of several insecticides as thermal aerosols or as larvicides for control of A. aegypti and C. p. quinquefasciatus in or near Bangkok. The compounds tested and their mammalian toxicity are shown in Table I.
- Agricultural Chemistry
- Pesticides Pollution and Control