Dynamics of pH and Specific Gravity of Haemolymph in different breeds of Silkworm Bombyx Mori L. Infested with Beauveria Bassiana(Bals) Vuill


  • G. Savithri, M. Sheeba Praveena, and A. Shobha Rani*


Silkworm Hybrids, Bombyx mori, haemolymph, pH and Specific Gravity, Beauveria bassiana


The present study concentrated on understanding the influence of Beauveria bassiana infection on the dynamics of pH and the specific gravity of haemolymph in three hybrids of the silkworm Bombyx mori. After being domesticated for millennia, silkworms are now sensitive to a variety of micro-pathogens and environmental factors that might impact the nutrition, metabolism, and physiological characteristics of haemolymph. For the investigation, the researchers employed bivoltine double hybrids (CSR2 X CSR27) X (CSR6 X CSR 26), bivoltine single hybrid (CSR2 X CSR4), and crossbreed (PM × CSR2) silkworm hybrids.

The bivoltine double hybrid, crossbreed, and bivoltine single hybrid showed an elevation of pH level up to the fourth, third, and second days, respectively. In the remaining days of the instar, all three breeds showed a progressive decline in pH. All of the breeds that were chosen for the study had a lower pH level than the control. Lower specific gravity was recorded, and it stayed constant from the first to the fourth day, then significant enhancement of specific gravity was recorded in a bivoltine double hybrid. With reference to the crossbreed and bivoltine single hybrid, it was constant until the third and second days, respectively. The remaining days of the instar in the experimental silkworms were marked by a significant increase in specific gravity.