Effects of Natural (Sorghum) and Artificial (Wheat Germ) Diets on Development of the Corn Earworm, Fall Armyworm, and Southwestern Corn Borer1

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Abstract
Developmental characteristics of larvae of corn carworm, Heliothis zea (Boddie); fall armyworm, Spodoptera frugiperda (J. E. Smith); and southwestern corn borer, Zeadiatraea grandiosella (Dyar), reared on sorghum, were compared with the same species reared on artificial diet. In each of the 3 species, no significant differences were observed in head-capsule widths in the several instars of larvae fed on the 2 diets. It was found, further, that a change in diet from sorghum to artificial diet or from artificial diet to sorghum, at various intervals in the larval cycle, had little effect on pupal weight or duration of the larval cycle of the 3 species.