Chlorothalonil is a high efficacy, broad spectrum and safe fungicide for agricultural and forest usage, It has protective and remedial efficacy, long persistent time .It is as fungicide to prevent and cure wilt of cotton, anthracnose of cotton, rust of peanut, also can prevent and cure anthracnose of cucumber, powdery mildew of cucumber, early blight of tomato,downy mildew, black and brown spot and so on.