The Toxicities of Some Chlorinated Hydrocarbons to Various Larval Instars of the Army Cutworm in the Laboratory1

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Abstract
Of the chemicals tested as contact and as stomach poisons for the control of army cutworm, Chorizagrotis auxiliaris (Grote), endrin was the most toxic sixth-instar larvae and was equally effective as contact and as a stomach poison. The compounds appeared in the following order of toxicity: as contact poisons, endrin > dieldrin=aldrin=heptachlor >chlordane, and as stomach poisons, endrin = dieldrin >aldrin=heptachlor >chlordane. Fourth- to fifth-instar larvae were more readily killed by contact than sixth-instar larvae with each of the compounds. The susceptibiliy successive molts. Endrin was 35 times as toxic to fourth-instar 11 times as toxic to fifth-instar, and three times as toxic to freshly molted sixth-instar larvae as to mature feeding sixth instar cutworms.

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