Toxicity of New Insecticides to Corn Earworms on Sweet Corn1

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Abstract
Experiments to control the corn earworm (Heliothis zea (Boddie)) were continued in southern California during the 3-year period, 1959-61. Forty-four different formulations were tested by the individual-ear, paintbrush dust method. Zectran ® (4-dimethylamino-3, 5-xylyl methylcarbamate), Sevin® (I-naphthyl N-methylcarbamate), Cynem® (O, O-diethyl O-2-pyrazinyl phosphorothioate) and malathion were equal to or slightly better than a 5% DDT standard treatment. Bayer 32651 (3-methyl-4-methylthiophenyl N-methylcarbamate), Bayer 41831 (O, O-dimethyl O-4-nitro-m-tolyl phosphorothioate), Union Carbide 10854 (m-isopropylphenyl methylcarbamate), Dylox® (O, O-dimethyl 2,2,2-trichloro-1-hydroxyethyl phosphonate), and Bayer 30911 (methyl O-methyl O-2,4-dichlorophenyl phosphonothioate) were nearly as effective as the standard DDT, while all other treatments were poorer or ineffective. Between 1948 and 1961 many experiments were conducted for the control of the corn earworm, Heliothis zea