Effect of temperature and relative humidity on moth emergence and fecundity of different eco-races of eri silkworm, Samia ricini (DONOVAN).

摘要

Four eco-races of eri silkworm, Samia ricini (DONOVAN) namely Borduar, Mendipathar, Titabar and Dhanubhanga were selected to study the effect temperature and relative humidity on moth emergence and egg fecundity. These eco-races were subjected to different temperature and relative humidity treatments. The effect of temperature and relative humidity was observed in moth emergence, egg fecundity, larval duration, larval weight, single cocoon weight, single shell weight and shell ratio during winter 2009 and spring 2010 rearing. There was no significant difference among the eco-races of eri silkworm on moth emergence during winter 2009 (F 3, 11=0.82, P>0.05) and spring 2010 (F 3, 11=0.18, P>0.05) rearing seasons but there was a significant difference on moth emergence between winter and spring seasons (t=4.33, P<0.05). The outcome of the study clearly shows the effect of temperature and relative humidity on moth emergence, egg fecundity, larval duration, larval weight, single cocoon weight, single shell weight and shell ratio.