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Some of the old insecticides such as the chlorinated hydrocarbons, DDT, chlordane, heptachlor, etc., might take a few hours to cause mortality. The newer compounds kill in minutes or at the most, an hour. The half life of these materials is measured in a few days. In other words, they don't last long in the field. Unless there is a serious insect outbreak, fields won't be sprayed. Applications are closely regulated as far as dosage, preharvest interval, and registration for specific crops.