Abstract
The relationship between corpus allatum (CA) and prothoracic gland (PG) activities has been examined during postfeeding larval and prepupal stages of en-silkworm, Philosamia ricini (Dru.). Using the isolated larval abdomen technique, the critical period of ecdysone (MH) was determined. It was 114 hr immediately after the beginning of cocoon spinning at 20 ± 2°C. To study the CA activity a histometric method was used. CA volumes suddenly increased at the prepupal stage. From these data a clear positive correlation between CA and PG activities was recognized.
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