DORESWAMY, C.MANJUNATH, G. C.2020-10-052020-10-052018-12-21https://krishikosh.egranth.ac.in/handle/1/5810152318In-vitro and In-vivo studies on evaluation of acetone extract of medicinal plants for the management of late larval flacherie of silkworm, Bombyx mori L. was carried out during 2017-2018 Among the nine medicinal plants tested in In-vitro studies, Ocimum tenuiflorum recorded maximum zone of inhibition against Bacillus sp., Asparagus officinalis against Staphylococcus sp. and Phyllanthus emblica against Streptococcus sp., respectively for the 10-4 and 10-6 dilutions compared to control. In In-vivo studies, flacherie inoculated silkworms (CSR2 and PM x CSR2) fed on mulberry leaves fortified with acetone extract of medicinal plant at 6 per cent concentration and its influence on larvae and economic traits were studied. Among the nine medicinal plants extracts experimented, A. officinalis administration was found significantly effective by enhancing the larval and cocoon quality parameters viz., larval duration (114.32, 161.55, 197.48 h and 82.74, 140.24, 189.10 h) III, IV and V instars respectively, mature larval weight (3.27 and 2.86 g/larva, 33.66 and 29.28 g/10 larvae), ET50 value for larval mortality (184.66 and 205.84 h), reduced larval mortality (18.00 and 12.66 %), ERR (79.33 and 86.67 %), cocoon weight (1.79 and 1.31 g/cocoon, 17.92 and 13.63 g/10 cocoon), shell weight (0.356 and 0.247 g/shell, 3.743 and 2.480 g/10 cocoon shell), pupal weight (1.40 and 1.06 g/pupa, 14.32 and 11.15 g/10 pupae), shell ratio (20.03 and 18.90 %/shell, 20.92, 18.15 %/10 cocoon shell), silk filament length (1066.33 and 752.00 m) and denier (2.61 and 2.64) in both the breeds viz., CSR2 and PM x CSR2 compared to control.EnglishThesis