BHASKAR, R.N.ANITHARANI, K.V.2021-09-282021-09-282018-08-01Th-12074https://krishikosh.egranth.ac.in/handle/1/5810176375The flacherie diseased silkworms contain several species of bacteria viz., Streptococcus faecalis, Staphylococcus aureus, Serratia marcescens. and Bacillus sp. The spread of the disease can be minimized by the application of chemical bed disinfectants which are leaving residual toxicity. Therefore the use of botanical formulations not only found effective against bacterial infection but also enhances the growth of silkworm and have less residual effect. Different forms and methods of application of Adathoda vasica and Tinospora cordifolia were tried in-vitro and in-vivo for management of bacterial infection in silkworm. Among three bacterial species (Bacillus sp., Staphylococcus sp. and Streptococcus sp.) were isolated, the maximum zone of inhibition observed in cold alcoholic extract of Adathoda vasica on 24 (8.00 and 9.12 mm) and 48 (8.99 and 9.62 mm) hours of incubation and minimum of same was noticed (7.66, 8.46 and 8.25, 8.94 mm) in Aqueous form of Tinospora cordifolia against Bacillus sp. of 10-5 and 10-7 spore dilution. Further, the in-vivo effect of cold alcoholic extract of Adathoda vasica was recorded maximum larval weight (27.72 and 27.87 g/10) and ERR (94.00 and 96.13 %) with minimum larval weight reduction (3.12 and 2.87 %) and larval mortality (5.83 and 3.50 %) in 10-7 bacterial spore dilution. Whereas the economic parameters viz., cocoon weight (6.04 and 6.32 g/5), shell weight (0.980 and 1.016 g/5), shell percentage (16.24 and 16.32 %) and filament length (826.06 and 835.09 m) were found maximum in alcoholic extract of Adathoda vasica administered batch at fourth and fifth instar of PM × CSR2 followed by acetone, aqueous and dust form of application.EnglishThesis