Abstract

                                Investigations were undertaken to assess the performance of new bivoltine hybrid (CSR46 X CSR47), double hybrid ](CSR6 X CSR26) X (CSR2 X CSR27)[ and bivoltine hybrid (CSR2 X CSR4) along with cross breed (PM X CSR2) in five districts of Tamil Nadu, namely Coimbatore, Salem, Dharmapuri, Pudukkottai and Tirunelveli . The result showed that double hybrid recorded significantly highest economic traits, viz., cocoon weight, shell weight, shell ratio, filament length and filament weight. The denier of double hybrid was also found to be significantly finer than all other hybrids tested. Significant difference in economic traits existed between silkworm hybrids and for the same hybrid in their performance in different districts in the present study.

Key words : Silkworm, bivoltine hybrids, cross breed, silkworm-growing districts of Tamil Nadu