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Plant Disease

Medium Severity

Tikka Leaf Spot (Groundnut)

Affects: Groundnut · August–October (Kharif); humid, warm weather favours disease development

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Causal Organism

Cercospora arachidicola (early leaf spot); Phaeoisariopsis personata (late leaf spot) — fungi

Symptoms

Early leaf spot: circular spots with yellow halos on upper leaf surface. Late leaf spot: dark spots with no yellow halo, more serious. Both cause severe defoliation reducing pod fill.

Prevention

Crop rotation (avoid groundnut continuously). Use certified disease-free seed. Proper spacing for air circulation. Remove crop debris after harvest.

Season Risk: August–October (Kharif); humid, warm weather favours disease development

Treatment

Tebuconazole (0.1%) or chlorothalonil (0.2%) at first sign of disease. Spray at 10–14 day intervals during humid periods. 4–5 sprays may be needed in high-disease years.

Frequently Asked Questions

How much yield loss does tikka leaf spot cause?
Severe tikka leaf spot can cause 50–70% yield reduction due to defoliation affecting pod fill. Economic injury threshold is 5% leaves affected — spray before this point.

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Affected Crops

Groundnut Farming Guide →