The aim of this lecture is to present on Pesticides. Pesticides kill insects that will damage crops. They also kill harmless insects or can get washed into rivers and pollute the water. They may even end up in the food chain. Pesticides are the only toxic substances released intentionally into our environment to kill living things. This includes substances that kill weeds (herbicides), insects (insecticides), fungus (fungicides), rodents (rodenticides), and others.