Among the five leaf extracts (black pepper, carrot, lemon grass, neem and green chilli+ garlic paste) all at 5% concentration, tested against Aphis gossypii infesting Mentha arvensis L. at medicinal plant garden of Narendrapur, West Bengal, revealed that black pepper leaf extract was the best, registering mortality of 82.32% followed by lemon grass (mortality-70.86%), green chilli+ garlic paste (mortality-68.99%), followed by carrot (mortality-65.93%) and neem leaf extract (mortality-46.57%).