caused by any of a variety of plant diseases that produce well-defined areas of tissue to die creating noticeable spots in the leaves

Dead or discolored areas on the leaf tissue that are fairly small and are usually circular. Picture: Impatiens Necrotic Spot Virus on gloxinia

Lesions of dead and dying cells on leaves.

Any of various fungal or bacterial diseases t ...

Drechslera spp. Also called Melting out. Minor diseases of some turf grasses; the main ones being on perennial ryegrass and smooth stalked meadow grass.

a round or oval area with a distinct border that appears on the leaf blade