The experiment was conducted at Department of Agricultural Entomology, College of Agriculture Latur (M.S.). The Completely Randomized Design with three treatments and five replications. Disease free eggs of silkworm hybrids PM x CSR2 were utilized. The treatments were V-1, S-1635 and M-5. Observations on the larval instars duration, biometrics and different economic traits of silkworm Bombyx mori L. were taken.