Control fungal diseases in your garden with Fung-onil Multi-Purpose Fungicide. The active ingredient, chlorothalonil, is an effective ingredient in preventing a variety of fungal diseases that are common in plants. This broad-spectrum fungicide is effective in the control and prevention of many garden diseases including leaf spot, rust, blight, rot, mildew scab, mold, and more. Can be applied to a variety of types of plants, including fruits, vegetables, beans, trees, flowers, and shrubs. For full use instructions, please see product label.