Control of the Corn Earworm Attacking Sweet Corn1

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Abstract
Following a season of extensive damage to the commercial sweet corn crop, producers on Long Island became alarmed at the possibility that the corn earworm, Heliothis zea (Boddie), had become resistant to DDT. Experiments conducted during the next three seasons dispelled this view. Sevin® (1-naphthyl-N-methyl carbamate), used at equivalent rates, was shown to be as effective as DDT. Endrin, Thiodan® (6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4,3-benzodioxathiepin-3-oxide), Guthion® (O,O-dimethyl S-(4-oxo-3H-l,2,3- benzotriazine-3-methyl) phosphorodithioate), and Shell 4402 (1,3,4,5,6,7,8-octaehloro-3a,4,7,7a-tetrahydro-4,7-methanophthalan) gave promising results at the dosages used. In addition, endrin, DDT, Guthion, Phosdrin® (1-methoxycarbonyl-lpropen-2-yl dimethyl phosphate), and ryania were found to reduce considerably ear damage caused by the European corn borer, Pyrausta nubilalis (Hbn.). Thiodan was partially effective. Analyses of corn samples revealed the absence of DDT and the presence of insignificant residues of Sevin on the husked ear. Experiments conducted concurrently with the aforementioned tests revealed that the addition of various surface-active supplements to DDT sprays apparently had little or no effect in enhancing or prolonging the effectiveness of the sprays with the possible exception of Atlas NNO which, in one test, seemed to improve control.

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