National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
In present investigation, the bioefficacy of aqueous and methanolic leaf extracts of Ocimum sanctum were tested to evaluate their toxic effects at different concentration (10.00, 7.50, 5.00, 2.50, 2.00, 1.50, 1.00 and 0.50 percent) against mixed population of Tetranychus urticae on tomato during 2018 under in vitro conditions. T. urticae responded to the mite in a concentration dependent manner i.e. lowest number of live mites and highest mortality in population was obtained with highest concentration tested (10.0%). Out of an initial number 10 mite, significantly less number of mites were recorded at 10.00 percent concentration of O. sanctum leaf extract followed by 7.50, 5.00, 2.50 and 2.50 per cent concentration than 1.50, 1.00 and 0.50 percent treatment and control. Direct spray bioassay results clearly revealed that aqueous and methanolic leaf extract of O. sanctum possessed acaricidal activity. Mites responded to extract in a concentration dependent manner. The methanolic leaf extract was more potent to T. urticae causing 20 to 71.9 percent mortality at 0.5 to 10 percent concentration as compared to aqueous leaf extract (6.7 to 61% mortality). The LC50 value in methanol extract was 3.46 percent while it was 7.06 percent in aqueous extract against T. urticae.
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