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This is a commonly occurring disease on foliage of beet roots. High humidity usually favours the spread of this disease.
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Numerous small circular spots appear on the leaf surface. The spots increase in size, becoming brownish or purplish in color.
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Individual spots are usually circular but several may coalesce into larger areas of dead tissue.
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The spots dry up giving a shot-hole appearance to the leaves. In case of severe infection spots cover the entire leaf surface resulting in pre-mature death and dropping of the leaves.
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As leaves die, the crown becomes cone-shaped with a rosette of dead leaves at the base.
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Defoliation occurs throughout the growing season resulting in reduction in root size and yield. Older leaves are mostly affected.