Maize is highly vulnerable to infestation by the maize weevil (Sitophilus zeamais). The widespread use of synthetic insecticides in pest management has raised significant environmental and health concerns, necessitating the exploration of sustainable, plant-based alternatives. This study evaluated the insecticidal, repellent, and emergence inhibition of methanolic extracts from Aframomum melegueta, Pterocelastrus tricuspidatus, and Bryophyllum pinnatum against Sitophilus zeamais in stored maize. Standard phytochemical and antioxidant analytical techniques were used to assess the insecticidal efficacy of the plant extracts. Phytochemical screening revealed that A. melegueta possessed the highest phenols (10.65 mg/100g) and tannins (3.83 mg/100g) contents, while P. tricuspidatus recorded the highest flavonoids (3.90 mg/100g), saponins (1.44 mg/100g), and cardiac glycosides (8.31 mg/100g) levels. B. pinnatum showed the highest alkaloid content (7.85 mg/100g). Antioxidant activity assessed by DPPH radical scavenging showed strong activity across all extracts, with A. melegueta exhibiting the highest activity (74.13%). Bioassay results demonstrated a concentration and time-dependent mortality in S. zeamais, with B. pinnatum showing the highest mortality of 83.33% at 5% after 36 h, while P. tricuspidatus achieved 76.67% at 2%. Repellency assays showed that all extracts significantly deterred insect presence, with P. tricuspidatus exhibiting superior repellency even at lower concentrations. Additionally, adult emergence inhibition was most pronounced at 10%, with P. tricuspidatus and B. pinnatum recording 0.00% emergence within 12 and 24 hs, respectively. These findings highlight the potential of these plant extracts as eco-friendly insecticides. Their rich phytochemical composition, potent antioxidant properties, and strong bioactivity support their application in postharvest grain protection and integrated pest management (IPM) strategies.