Abstract
Of 12 chemicals tested against the corn earworm, Heliothis zea (Boddie), in sorghum heads, carbaryl, DDT, mevinphos, Telodrin® (1,3,4,5,6,7,8,8-octachloro-1,3,3a,4,7, 7a-hexahydro-4,7-methanoisobenzofuran), and naled gave the best control. The addition of pyrethrum to DDT emulsion spray did not increase the effectiveness of this insecticide. When comparable dosages and gallonages of the same insecticides were applied, control was usually better against the smaller larvae. A residue test with carbaryl showed residues well within the accepted tolerance on grain and forage.
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