Effects of long day and short day treatments during the embryonic and larval stages on induction of pupal diapause were studied on a diapausing race of
Sarcophaga peregrina. Two long day (15L 9D) cycles during 2 days before or after the larviposition completely stopped the induction of pupal diapause on larvae which grow in short day condition before and after the long day treatment.
The sensitivity appeared to decrease during the early stage of the third instar and to increase again to some extent in the prepupal stage.
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