Abstract:

This study evaluates the repellency and toxicity of selected medicinal plant extracts against Sitophilus oryzae, a destructive pest commonly infesting stored grain. The increasing demand for eco-friendly pest management solutions has highlighted the potential of plant-based insecticides as viable alternatives to synthetic chemicals. The research involved testing the efficacy of various plant extracts, focusing on their ability to repel and kill S. oryzae at different concentrations. The toxicity of the plant extracts was assessed by monitoring insect mortality at 12, 24, 48, and 72 hours post-exposure, while repellency was determined by observing the avoidance behavior of S. oryzae in treated environments. Results indicated that certain plant extracts exhibited strong toxic effects, leading to significant mortality rates compared to the control group. Repellency tests showed that the plant extracts reduced S. oryzae infestation by up to 80%, demonstrating their potential as natural insect repellents. This study supports the use of medicinal plant extracts as effective, environmentally friendly alternatives to chemical insecticides for the control of Sitophilus oryzae, promoting sustainable practices in grain storage and pest management.