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Malathion Resistance in Aedes Aegypti of Puerto Rico Induced by Selection Pressure on Larvae

Irving FoxDepartment of Microbiology and Medical Zoology, School of Medicine, Medical Sciences Campus, University of Puerto Rico, San Juan, Puerto Rico

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A high level of tolerance to malathion occurred in Aedes aegypti larvae of San Juan, Puerto Rico in 1978. The tolerance was 7-fold when compared with a susceptible strain. Malathion selection pressure in the laboratory on this tolerant strain resulted in resistance after only six filial generations. The resistance of the F6 generation was 10-fold when compared with the strain as it was in the field in 1969, and 19-fold when compared with a susceptible laboratory strain. The results, together with those of previous studies. suggest that resistance may be a major factor in situations in Puerto Rico in which malathion failed to control Ae. aegypti.