EFFECT OF BIOCHEMICAL CONSTITUENTS (SELECTED) OF MEDICINAL PLANTS ON SILKWORM REARING AND BmNPV MANAGEMENT
Loading...
Date
2009-07-15
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of Agricultural Sciences, Bangalore
Abstract
The study on the “Effect of biochemical constituents (selected) of medicinal plants on silkworm rearing and BmNPV management” was
undertaken in the Department of Sericulture UAS, GKVK, Bangalore-65. Aqueous extracts of different medicinal plants viz., Adathoda vasica, Bougainvillea spectabilis, Phyllanthus niruri, Terminalia arjuna and Pongamia glabra administered to silkworm through mulberry leaves once during fourth and fifth instar larvae of PMxCSR2 revealed positive response to the botanical treatments. However, there was an increase in mature larval weight from 26.31 to 27.85 and 26.46 to 28.68g/10 and silk productivity (3.34 to 4.23 and 3.52 to 4.60cg/day) which were recorded for P. glabra and P. niruri administered batches respectively and reduced total larval mortality (20 to 9 and 15 to 7%) over the control (25 to 21%). The trend was same even on cocoon parameters of both the instars. The fourth and fifth instar experimented batch administered with different hours of medicinal botanical treatment BmNPV polyhedra revealed antiviral action. This is due to antiviral property of total phenols and tannins present in aqueous extracts of A. vasica, B. spectabilis, P.
niruri, T. arjuna and P. glabra. Among four hours of treatment (0,3,5 and 7h), 7 hour of treatment to BmNPV showed increase in larval weight (24.65g/10), reduced fifth instar and total larval duration (9.14 and 30.64days), increased ET50 for symptom expression and ET50 for mortality (4.49 and 9.79 days), reduced total mortality (8.50%), higher ERR (91.50%) and all the cocoon parameters in P. niruri treated lots of fourth instar silkworms followed by B. spectabilis, T. arjuna, A. vasica and P. glabra. The trend was same, even in fifth instar treated batches. It is further confirmed that, presence of above biomolecules might have act as viral inhibitors in avoiding infection by BmNPV as well as enhancing silk yield and quality.
Description
Keywords
null