A section showing Cercospora beticola conidia taken from lai saak leaves, viewed under foldscope , ICAR-NOFRI ,Sikkim.

Symptoms:

Infection and lesion formation initially occur on older leaves before progressing to newer ones. Lesions at maturity are 1/8 inch in diameter and appear light gray-colored to dark tan with a brown to purple border. Severely affected leaves wither and die from coalescing lesions.