Cassava Brown Streak DiseaseIdentification & Treatment Guide 2026
Cassava brown streak virus (CBSV) · Family: Potyviridae
Cassava brown streak disease (CBSD) is a viral disease causing dry, brown necrotic rot inside cassava tubers, making them inedible. Above-ground symptoms include yellow blotches on older leaves and brown streaks on stems. Use resistant varieties (e.g., NASE 19, Kiroba), plant clean cuttings, rogue infected plants, and harvest within 12 months before tuber necrosis worsens.
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criticalCassava Brown Streak Disease
- Affects
- leavesstemstubers
- Peak Season
- Year-round; tuber necrosis worsens with extended time in the ground (>12 months)
- Spread Risk
- Moderate
- Spread By
- Whitefly (Bemisia tabaci), infected stem cuttings
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Symptoms: What does Cassava Brown Streak Disease look like?
Visual identification guide — tap each stage for details
Feathery yellow patches on mature leaves
Irregular, feathery yellow chlorotic patches appear on mature (lower) leaves, often around secondary and tertiary veins. Easily mistaken for nutrient deficiency.
Brown streaks on green stems
Brown or purple-brown elongated streaks and patches appear on green portions of stems. Leaves may show more pronounced chlorosis and some necrotic spots.
Dry brown necrotic rot in tubers
Tubers develop dry, brown, corky necrotic areas when cut open. Necrosis may be mild (scattered spots) to severe (entire tuber unusable). Only visible when tuber is harvested and cut.
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