EFFECT OF CULTIVATED SEA PLANT (Kappaphycus sp.) EXTRACTS ON GROWTH AND DEVELOPMENT OF MULBERRY AND SILKWORM, Bombyx mori L
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Date
2020-12-28
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University of Agricultural Sciences, Bangalore
Abstract
Three sets of experiments were conducted separately using four formulations of the sea plant extract (SPE) viz., LBD3, LBD12, LBS6 and LBS13 in different concentrations. In the first set, SPE were used as foliar spray on mulberry where LBS13 @ 1.5 ml/l and LBS6 @ 1.5 ml/l recorded increased growth and quality parameters at 30, 45 and 60 DAP and also improved the rearing and reeling parameters of silkworms when fed with treated leaves. LBS13 @ 1.5 ml/l and LBS6 @ 1.5 ml/l were also found to boost the immunity of worms against BmNPV when the leaves harvested from treated plants were fed to the inoculated batches. Sea plant extracts were fortified and fed to the healthy silkworms, LBD12 @1.5 ml/l, LBD3 @ 6ml/l and LBS13 @ 1.5 ml/l increased growth of worms and enhanced the cocoon weight. In the virus inoculated batches, the immunity against BmNPV infection was significantly enhanced in the larvae upon feeding mulberry leaves fortified with LBD12 @1.5 ml/l and LBD3 @ 6ml/l. In the third set, the best combination of the treatments based on observations of the two sets of experiments was considered for assessing the influence on performance of silkworms. Among different combinations, C5
(Foliar application of LBS6 @ 1.5 ml/l + Fortification with LBD12 @ 1.5 ml/l) performed better for all the rearing and reeling parameters of both healthy and BmNPV inoculated batch of silkworms. It was clearly evident from the present study that the biostimulants (LBS 13 and 6 @ 1.5 ml/l each) used as foliar spray followed by leaf fortification of bio-defence molecules (LBD 12 @ 1.5 ml/l and LBD 3 @ 6 ml/l) enhance the growth and boost immunity in silkworms against BmNPV infection.