Efficacy of aqueous Aegle marmelos leaf extract for the control of Megacopta cribraria

Abstract

Megacopta cribraria (F.), a pest of concern worldwide, has been extensively studied for control using synthetic pesticides. However, this study focuses on the efficacy of a plant-based extract derived from A. marmelos leaves. The ovicidal potential of crude A. marmelos leaf extract was tested at five concentrations (1.25%, 2.5%, 5%, 7.5%, and 10%), resulting in a maximum of 30% ovicidal action at the 10% concentration. The extract also exhibited deterrence activity against adult bugs. At all concentrations, significant deterrence was observed in terms of time spent on the treated surface and the frequency of visits. Bug activity decreased with increasing concentrations, spending only 2.5% of time on the treated surface at 10% concentration. Bug preference for the treated surface also decreased with concentration, with only 14% of visits on the treated surface at 10% concentration. This deterrence activity was supported by frequent grooming and avoidance behavior exhibited by the bugs, helping them cleanse their body receptors. The study concludes that A. marmelos shows potential as a biopesticide for controlling M. cribraria populations globally. These findings emphasize the need for eco-friendly alternatives to synthetic pesticides for effective pest control.