Effect of temperature and photoperiod on pupal development rates inPlanotortrix octoDugdale* (Lepidoptera: Tortricidae)

Abstract

The pupal development rate of Planotortrix octo was monitored at 17 and 21°C at photophases of 0, 2, 6, 12, 14, 16, 18, and 24 h. Development rate was faster at 21°C and females developed significantly faster than males. A negative correlation between development rate and photophase was observed, with this being most marked at 17°C. Superimposed on this was a faster development rate at intermediate photophases (12-16 h). This is discussed inrelation to a possible circadian mechanism for control of both larval and pupal development.