Blight refers to a selected symptom affecting plants in response to infection by a pathogenic organism. Blight is rapid and complete chlorosis, browning, then the death of plant tissues such as leaves, branches, twigs, or floral organs. Accordingly, many diseases that primarily exhibit this symptom are called blights. On leaf tissue, symptoms of blight are the initial appearance of lesions that rapidly engulf surrounding tissue. However, leaf spots may, in advanced stages, expand to kill entire areas of leaf tissue and thus exhibit blight symptoms. Blights are often named after their causative agent. For example, Colletotrichum blight is known as after the fungus Colletotrichum capsici, and Phytophthora blight is known as after the mold Phytophthora parasitica.