Systemic fungicides are a type of pesticide designed to control fungal diseases in plants. Unlike contact fungicides, which only affect the surface of the plant, systemic fungicides are absorbed and distributed throughout the plant's tissues. This allows them to protect not only the outer parts but also the inner areas where fungi may thrive. These fungicides are commonly used in agriculture and horticulture to manage diseases such as powdery mildew and root rot. They can be applied as sprays, drenches, or granules, depending on the specific product and the type of plant being treated.