Oils, spreaders and disinfectants are used to protect crops from pests, fungi, bacteria and viruses. Oils suffocate sensitive insects by coating them with a fine layer of oil that disrupts their ability to breathe. Spreaders allow for more even application of insecticides or fungicides over larger areas of land. Disinfectants can be added to irrigation water systems and other applications to help reduce disease-carrying organisms such as parasites and bacteria which may compromise crop health if not managed properly. Farmers should use these items because they help reduce the threat posed by pests, pathogens, insects and other potential harm caused by improper management practices without causing any damage themselves.