Not all insects attack crops. Many insects such as bees play an extremely critical role in agriculture. Spraying chemical pesticides and indiscriminately killing insects often severely distorts the ecological balance. NPM advocates for intelligent pest management. Bio-pesticides; an integral component of NPM, do not kill pests, but repel them. Concoctions made of locally available natural ingredients; bio-pesticides protect plants by warding off harmful pests. They act on pests in a non toxic manner and decompose quickly, thereby posing no threat to the environment. The commonly used bio-pesticide ingredients are extracts of neem, garlic, onion, turmeric, ginger, and cow urine.