A popular bivoltine silkworm hybrid (CSR2 x CSR4) larvae were orally fed with vitamin C-quantified crude methanolic extract of Emblica officinalis Gaertn fruit in six different doses during 5th instar at seven different application times. The dose and time-dependent effect on economic traits were observed. The best and repeatable results were recorded in 0.05% (C1) dose fed at 0 h of 5th instar once (T0) and 0 h to spinning daily once (T1) in larval weight (12.97-15.64%), pupation rate (8.50-11.24%), cocoon wt. (14.07-15.02%) and shell weight (15.11-16.55%) and there was no significant difference between the two application times (T0 & T1).