Rust of plants is a fungal disease that affects the leaves of many plants, causing them to become discolored, spotted, and eventually, fall off. There are several synonyms for rust of plants, including leaf rust, stem rust, and stripe rust. These terms are used to describe variations of the disease that target different parts of the plant. Leaf rust affects the leaves of the plant, whereas stem rust affects the stems, and stripe rust creates distinct stripe patterns on the leaves. Regardless of the type of rust, it is important to diagnose and treat the disease to prevent further damage to the plant.