Bio Pesticides are biochemical pesticides that are naturally occurring substances that control pests by nontoxic mechanisms. Conventional pesticides, by contrast, are generally synthetic materials that directly kill or inactivate the pests. For example, a plant in the presence of chitosan will naturally induce systemic resistance (ISR) to allow the plant to defend itself against disease, pathogens and pests. Bio pesticides are considered eco-friendly and easy to use.