Day-to-day analysis of nitrogenous products in Different Mulberry Silkworm Breeds during the Progressive infection of fungal pathogen Beauveria bassiana


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


Haemolymph, Silkworm, Bombyx mori, Beauveria bassiana, Ammonia, Urea, and Uric Acid.


The silk industry is a viable rural-based enterprise that aims to uplift the socio-economic standards of its practitioners. Silk, the secretion of silkworms, is one of the natural fibers and highly valued textile fibers of animal origin used for the production of high-quality textiles. The occurrence of silkworm diseases is a major challenge for the silk industry and leads to crop loss. Among silkworm diseases, fungal disease is one of the most common and contagious during silkworm rearing in the rainy and winter seasons and causes considerable damage to cocoon production. The pathogenic microorganism that causes white muscardine disease in the silkworm Bombyx mori is Beauveria bassiana. In the current investigation, the major nitrogenous wastes such as ammonia, urea, and uric acid were analysed during the progress of the fungal pathogen in three silkworm breeds, viz., bivoltine double hybrid (CSR 2 x CSR 27) x (CSR 6 x CSR 26), crossbreed (PM × CSR2), and bivoltine single hybrid (CSR2 x CSR4) in the 5th instar silkworm Bombyx mori.  In the inoculated silkworms, a decrease in ammonia content was noted, an increase in urea content in the early stages and a decline in the remaining days of the instar, and an increase in uric acid contents in the haemolymph when compared with control batches. The development of muscardine was reflected in the declaration of perceptible morphological modifications, infection manifestations, and mortality in silkworms.