Fungicide

Fungicide, substance used to kill fungi and so to control fungal diseases in humans and plants. In medicine some antibiotics, sulfur, carboxylic acids, and potassium iodide are used. In agriculture a wide variety of fungicides are used, both inorganic (e.g., Bordeaux mixture and sulfur) and organic (generally containing sulfur or nitrogen). They are applied to the soil before planting or around seedlings, or they are sprayed or dusted onto foliage.