EFFECT OF CHANGING ENVIRONMENTAL CONDITIONS ON QUALITATIVE AND QUANTITATIVE TRAITS IN MULTIVOLTINE X BIVOLTINE SILKWORM HYBRID OF BOMB VXMORI L.

The commercial multivoltine x bivoltine silkworm hybrid namely. PI x CSR2 was chosen for the present Liudy. The hybrid was subjected to different temperature and humidity treatments I.e. 25 i IC and RH 65 ± 5% (control). 30 ± 1°C. with combinations of low relative humidity (RH 50 ± 5%) and high RH (85 ± 5%) at different stages during rearing and spinning of silkworm larvae. The larvae of after 3rd moult were subjected to different thermal and humidity stress. The comparative rearing performance clearly indicated that the deleterious effect of high temperature and high RH was more pronounced for the majority of traits such as survival, cocoon yield, shell weight, shell percentage, reelability, filament length, raw silk percentage and filament size than other temperature and RH treatments. However, filament neatness did not much altered due to changing environmental conditions. The characters can be improved by providing ideal environmental conditions even during spinning stage of larvae those affected with high temperature and Rh.