Chlorothalonil is a nonsystemic chloronitriles fungicide. It is used to control fungi affecting a number of agricultural crops, turf, and paint. It may also be used to kill mildew, bacteria, algae, and insects. Chlorothalonil is approved for use on a number of agricultural crops including coffee, tomato, peanut, onion, garlic, potato, beans, and many other food and feed crops. It is used on some commercial grasses such as golf courses and it can be found in residential products for ornamental plants and lawns.