Abstract
In the normal sequence of fly development, the ecdysteroid titre, which is high at the time of pupariation, drops and then rises several days later at the onset of adult development. When the ecdysteroid titre was maintained at a high level by injection of exogenous hormone, pupal ecdysis was delayed or entirely prevented. In the most severe cases, moulting fluid was not absorbed, a gas bubble was retained in the gut, and the head failed to evaginate. In addition, exogenous ecdysteroids averted pupal diapause in short-day flies. Maximal sensitivity for prevention of diapause occurred 24–30 h after pupariation (20°C), and peak sensitivity in blocking pupal ecdysis occurred at 42 h. We conclude that the decline in ecdysteroid titre is a prerequísite for pupal ecdysis and the expression of pupal diapause.
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