EFFECT OF GRASSERIE ON GONADOSOMATIC INDEX (GSI) AND TISSUE SOMATIC INDEX (TSI) OF DIFFERENT COMMERCIAL BREEDS AND HYBRID OF BOMBYX MORI L.

摘要

Silk worm Bombyx mori L is commercially reared in different sericultural regions of West Bengal, India. The major commercially silk producing districts of West Bengal are Malda, Murshidabad and Birbhum. Grasserie, a viral disease caused by Bombyx mori Neuclear Polyhedrosis Virus (BmNPV) causes maximum damagae to the crop during unfavourable rearing seasons. In the present study Nistari (Multivoltine), NB4D2 (Bivoltine) and NistarixNB4D2 (Hybrid) of B.mori are used to determine the Gonadosomatic Index (GSI) and Tissue somatic Index (TSI) before and after grasserie infection to access the impact of growth of tissue in body as well as gonad in enhancement of the sericulture in broad sprectrum