IN VITRO AND IN VIVO EFFICACY OF ALOE VERA (L.) N. BURMAN IN MANAGEMENT OF BACTERIAL FLACHERIE OF SILKWORM, BOMBYX MORI L.
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Date
2009-07-10
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Studies on the influence of In-vitro efficacy of Aloe vera gel leaf extract on inhibition zone of Bacillus sp. and In-vivo efficacy of Aloe vera gel extract administered with Bacillus sp. and administration of only Aloe vera gel extract on larval growth, development and economic traits of silkworm, were conducted during 2008-09. In-vitro efficacy of Aloe vera gel on inhibition zone of Bacillus sp. revealed significant results against raw gel and sterilized gel. The maximum zone of inhibition was found in 100 and 75 per cent Aloe vera gel extracts followed by 50 and 25 per cent compared to control against raw gel batch. Whereas, no zone of inhibition was observed in sterilized gel batch of the above mentioned concentration. The silkworm (PMxCSR2) reared on mulberry leaves smeared with Aloe vera gel extract of 100 per cent concentration at 10-3 bacterial spore dilution had effective enhancement of larval weight (3.24g), ERR (94.50%), cocoon weight (1.89g), shell weight (0.327g), pupal weight (1.559g), shell ratio (17.29%), silk productivity (4.19 cg/day) and filament length (853.77m) besides reduced larval duration (7.80 days) and disease incidence (9.20%) when compared to 10-2 and 10-1 bacterial spore dilution and control. Similarly, silkworms reared on mulberry leaves smeared with Aloe vera gel extracts also exhibited significant differences with respect to In-vivo studies. However, larval weight (3.40g), ERR (96.37%), cocoon (1.93g), shell (0.340g) and pupal weights (1.59g), silk productivity (4.45 cg/day) and filament length (903.94m) were significantly maximum in 100 per cent Aloe vera gel extract, besides reduced larval duration (7.62 days) and disease incidence (3.62%) compared to other treatments and control. Among the concentrations, 100 per cent concentration showed significantly higher values for larval and cocoon traits compared to 75, 50 and 25 per cent concentrations. Among the bacterial spore dilutions 10-3 bacterial spore had effective enhancement of larval and cocoon parameters compared to 10-2 and 10-1 bacterial spore dilutions.
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