Abstract
The hormonal control of evagination of the imaginal leg discs of the fleshflySarcophaga crassipalpis was studied by means of ectopic transplantation of discs from mature larvae or prepupae onto prepupal hosts. Evagination was influenced by the age of the donor and the developmental commitment of the host. Discs from non-diapuse as well as diapause-committed donors did not differ in their capacity to evaginate and differentiate. Mature larval discs from either type of donor could evaginate only when transplanted onto non-diapause hosts; they failed to evaginate on diapause-committed hosts even though host discs evaginated in situ about 40 h after transplantation. Discs from white prepupae evaginated whether transplanted onto non-diapause or onto diapause-committed hosts.
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