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Development of a Robust Polyvoltine Breed $ of the Mulberry Silkworm, Bombyx mori L.  

Singh Ravindra (Central Sericultural Research and Training Institute)
Rao D. Raghavendra (Central Sericultural Research and Training Institute)
Sharma S.D. (Central Sericultural Research and Training Institute)
Chandrashekaran K. (Central Sericultural Research and Training Institute)
Basavaraja H.K. (Central Sericultural Research and Training Institute)
Kariappa B.K. (Central Sericultural Research and Training Institute)
Dandin S.B. (Central Sericultural Research and Training Institute)
Publication Information
International Journal of Industrial Entomology and Biomaterials / v.12, no.1, 2006 , pp. 29-34 More about this Journal
Abstract
A breeding programme was initiated during 2001 utilizing two polyvoltine silkworm breeds viz. $BL_{69}$, an evolved breed tolerant to high temperature and MAR, comparatively resistant to Bombyx mori nuclear polyhedrosis virus (BmNPV) with the objective to develop robust polyvoltine breeds and hybrids. The breed $NP_1$ was developed by exposing the fifth instar larvae to high temperature $(36{\pm}1^{\circ}C)$, high Relative Humidity ($85{\pm}5%$ R.H.) and inoculating third instar larvae with BmNPV inoculum. At $F_{12}$, the breed was tested for hybrid forming ability utilizing six bivoltine silkworm breeds viz. $CSR_2,\;CSR_4,\;CSR_{17},\;CSR_{18},\;CSR_{19}\;and\;NB_4D_2$. The hybrid $ exhibited its superiority by recording 97.2% survival, 1.892 g cocoon weight, 0.406 g cocoon shell weight, 21.5% cocoon shell ratio, 16.6% raw silk percentage and 890 m filament length whereas the control $(PM{\times}CSR_2)$ has recorded 90.2% survival, 1.599 g cocoon weight, 0.304 g cocoon shell weight, 18.9% cocoon shell ratio, 13.1 % raw silk percentage and 768 m filament length. Commercial exploitation of the new $polyvoltine{\times}bivoltine$ hybrid in sericulture industry has been discussed.
Keywords
Bombyx mori L.; BmNPV; Breeding; High temperature; $polyvoltine{\times}bivoltine$ hybrid;
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