A Comparison of the Toxicity of Insecticides for the Control of Corn Earworm on Sweet Corn1

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Abstract
Experiments to control the corn earworm, Heliothis zea (Boddie), have been conducted in southern California with 69 different formulations during the past 10 years. These individual-ear, paint-brush dust tests showed Sevin® (1-naphthyl-N-methyl carbamate), Thiodan® (6,7,8,9,10, 10-hexachloro-1,5,5a,6,9,9a-hexahydro- 6,9-methano-2,4,3-benzodioxathiepin-3-oxide), heptachlor, Dipterex® (O, O-dimethyl 2,2,2-trichloro-1-hydroxyethylphosphonate), and isodrin equal to or slightly better than a 5% DDT standard treatment. The higher dosages of malathion, Diazinon®(O,O-diethyl O-(2-isopropyl-4-methyl-6-pyrimidinyl) phosphorothioate) and Guthion® (O, O-dimethyl S-(4-oxo-3H-l, 2,3-benzotriazine-3-methyl) phosphorodithioate) approached DDT in effectiveness, while all other materials were poor or ineffective.

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