The Toxicity of Eight Organic Insecticides to the Armyworm,

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Abstract
In general small or young larvae of Cirphis unipuncta were more easily killed than older or more mature larvae. In contact effect, based on LD50 values, parathion was the most toxic insecticide, followed in order by dieldrin, TM-1, aldrin, lindane, toxaphene, chlordane, and DDT. As stomach poisons, the order of relative toxicity was the same, except that DDT was more toxic than was chlordane. Parathion gave the fastest kill of larvae, with TM-1, lindane, and DDT following in that order. Of the 3 materials (DDT, chlordane, and toxaphene) extensively used in the field, toxaphene was definitely superior to the other 2 in control.