Abstract
The postembryonic development of insects is directed by precise fluctuations in the titres of two families of hormones, the juvenile hormones and ecdysteroids. These titre changes are dictated by the dynamic interaction of these two endocrine systems in a complex interregulatory scheme. The nature of this interendocrine regulation during larval-pupal development is being intensively investigated in the tobacco hornworm, Manduca sexta. Interendocrine regulation in this species appears to be quite complex and involves various physiological processes, among them the competency of endocrine glands to produce the hormones, the involvement of multiple regulators at different levels, and temporally precise changes in hormone titres. The coordination of the entire process appears to occur within the brain, and the means by which this occurs seems to change as development progresses. Based upon current knowledge of the interendocrine regulation of larval-pupal development in Manduca, a model is presented that explains the nature and extent of this control in directing this insect's development. It is hoped that this model will serve as a foundation for future experiments designed to refine our understanding of the interendocrine regulation of insect postembryonic development.
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