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Endogenous levels of juvenile hormones 0, I, II and III have been measured each day during the 4th, 5th and 6th larval stadia of the Tomato moth, Lacanobia oleracea, using physico-chemical methods. Levels of the same hormones have also been measured at selected times during pupal development, and over the first 5 days of adult life in males, and in mated and virgin females. JH I and JH II were the...