Abstract
Several concentrations of substances known to be biologically active in insects were added to the standard larval diet for Heliothis spp., and their effects on the larval and pupal development and reproduction of the bollworm, Heliothis zea (Boddie), and the tobacco budworm, H. virescens (F.), were determined. Some compounds affected larval growth and development and/or the subsequent reproductive capacity of the treated insects. Therefore, these substances may have a possible role as insecticides and/or as chemosterilants.
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