Abstract
Leaves of Semecarpus kathalekanensis were subjected for soxhlet extraction by using solvents petroleum ether, butanol, methanol and distilled water. The crude plant extracts were evaluated for their ovicidal activity against Teak defoliator, Hyblaea puera in laboratory bioassays at 5% and 10% concentrations. Among the different extracts petroleum ether and ethanol extracts showed maximum egg hatch inhibition of 78.75% and 89.16% respectively, at 10% concentration level, which were significantly superior over rest of the treatments. The percentage of egg hatch inhibition increased significantly with the increase in concentration of extracts tested. The ethanol extract at 5% recorded 72.78% egg hatch inhibition, which is significantly higher than other extracts at that concentration level. Among the tested plant extracts, ethanol extract exhibited highest ovicidal action followed by petroleum ether extract.
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