Definition of eyespot
1 Zoology a light-sensitive pigmented spot on the bodies of invertebrate animals such as flatworms, starfishes, and microscopic crustaceans, and also in some unicellular organisms. 2a rounded eyelike marking on an animal, especially on the wing of a butterfly or moth. 3a fungal disease of cereals, sugar cane, and other cultivated grasses, characterized by yellowish oval spots on the leaves and stems.
- The fungus is typically Pseudocercosporella herpotrichoides, subdivision Deuteromycotina