author(s)
BS Bobade, CB Latpate and RB Dake

abstract
The present investigation was undertaken during August to December 2018, to study the economic traits of bivoltine silkworm hybrids on G-4 mulberry variety (Morus alba). The experiment was conducted in rearing house at Sericulture Research Unit, VNMKV, Parbhani laid in Randomized Block Design with eight treatments, replicated thrice. Disease free layings of silkworm hybrids (CSR₂×CSR₄), (CSR₁₆×CSR₁₇), (CSR₅₀×CSR₅₁), (S₈×CSR₁₆), SHP₂, SHR₁, DHR₄, DHP₅ procured from Central Sericulture Research & Training Institute, Mysore were used as test hybrid against mulberry variety G-4 in present investigation. During study it was observed that hatching percentage were significantly highest in hybrid CSR₁₆xCSR₁₇ (96.19 per cent), Minimum larval duration was observed CSR₂×CSR₄ (21.77). The weight of ten mature larvae was significantly superior in hybrids CSR₁₆xCSR₁₇ (40.44 g) and CSR₂×CSR₄ (38.40 g), In single cocoon weight hybrid CSR₁₆xCSR₁₇ (1.31 g) has shown superior performance. The hybrid CSR₁₆xCSR₁₇ (0.312g) recorded highest shell weight (g). The shell ratio (%) was higher in hybrid CSR₁₆xCSR₁₇ (24.17 per cent). The hybrids CSR₁₆xCSR₁₇ (951 m) CSR₂×CSR₄ (919 m), CSR₅₀xCSR₅₁ (907. m) recorded superior performance in filament length (m), hybrid CSR₁₆xCSR₁₇ (0.331 g) recorded significantly higher filament weight, the denier value and cocoon yield/10,000 larvae brushed were superior in hybrid CSR₁₆xCSR₁₇ (3.13) and SHR₁ (16.59 kg) respectively.