Abstract:The field experiments were conducted at Entomology Laboratory of Barrister Thakur Chhedilal College of Agriculture and Research Station, Bilaspur (Chhattisgarh) during 2021-22, to know the biology of mulberry silkworm,
Bombyx mori L. in laboratory. The freshly laid eggs by female silkworm were oval, ellipsoidal, about 1 mm in diameter and slightly dig in center of egg at dorsal side and ventral side flat in shape and lays about 300 to 500 eggs at a time on the egg sheet. The eggs were covered with gelatinous secretion by which they stick to the egg sheet. The average incubation period from 8 to 10 days whereas, the hatching percentage was 95.5±6.36 per cent.
The body colour of newly hatched larva was yellowish brown in colour with no any marking was observed on larval body. The head was distinctly visible, dark black in colour with shining head capsule, body elongated with numerous hairs arrangement on full larval body. The total larval period completed in an average of 27.5 days.
The freshly formed pupa appeared shinning yellow brown in colour which later on became dark brown in colour. The pre pupal days completed in an average of 2.5 days. The pupal period lasting in 10 days. The adult emergence varied from 60 to 75 per cent. The sex ratio of male and female (Male: Female) varied from 4:06 to 6:04. The total life cycle of male completed in an average of 53.5 days. The total life cycle of female completed in an average of 55.5 days.