Our results revealed that insecticide resistance against malathion and propoxur increased from 2007 to 2008. Biochemical assay results showed that the AChE insensitivity for 2 test years and insensitive AChE frequency had increased annually. Our results also showed that extensive usage of organophosphate and carbamate for pest control in agriculture is a key factor for malathion and propoxur resistance in all tested populations rather than direct usage of mosquito control.
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