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Use caution before using the insecticide Malathion Health Canada is advising Canadians to not use malathion products older than one year due to chemical changes in the product over time. Malathion kills insects by preventing their nervous system from working properly. Malathion is effective in killing mosquitoes, aphids, loopers, moths, beetles, leaf bugs and other pests. Alarmingly, when stored at elevated temperatures over time a toxic chemical called isomalathion can naturally form in malathion product
