Cassava Mosaic DiseaseIdentification & Treatment Guide 2026
African cassava mosaic virus (ACMV) · Family: Geminiviridae
Cassava mosaic disease (CMD) is caused by begomoviruses spread by whiteflies. Symptoms include yellow-green mosaic patterns on leaves, leaf distortion, and reduced tuber yields (20-95% loss). Use CMD-resistant varieties (e.g., NASE 14, TME 419), plant clean stem cuttings, rogue infected plants, and control whiteflies to manage the disease.
Scan This Plant NowQuick Diagnosis
highCassava Mosaic Disease
- Affects
- leavesstemstubers
- Peak Season
- Year-round; symptom expression strongest during rainy season when new leaf growth is rapid
- Spread Risk
- Fast
- Spread By
- Whitefly (Bemisia tabaci), infected stem cuttings used for planting
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Symptoms: What does Cassava Mosaic Disease look like?
Visual identification guide — tap each stage for details
Mild yellow-green mosaic on young leaves
Newly emerging leaves show a mosaic pattern of pale green to yellow patches interspersed with normal dark green. Pattern is irregular and follows no vein pattern.
Severe mosaic with leaf distortion
Mosaic becomes more pronounced with bright yellow areas. Leaves become misshapen — reduced in size, with twisted, curled, or wrinkled blades. Leaflets may be narrow and strap-like.
Stunted plant with small tubers
Severely infected plants are stunted with small, distorted leaves. Tuber yield reduced by 50-95%. Tubers are small and woody. Plants infected early may produce almost no harvestable tubers.
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