Yam AnthracnoseIdentification & Treatment Guide 2026
Colletotrichum gloeosporioides · Family: Glomerellaceae
Yam anthracnose (Colletotrichum gloeosporioides) causes dark necrotic lesions on Dioscorea alata leaves and vines, causing defoliation and 80-100% yield loss. D. rotundata is resistant. Manage with resistant D. alata varieties, seed tuber treatment, staking for air circulation, mancozeb sprays during rainy season, and crop rotation.
Scan This Plant NowQuick Diagnosis
highYam Anthracnose
- Affects
- leavespetiolesvinestubers
- Peak Season
- Rainy season; warm (25-30°C) wet conditions during active vine growth
- Spread Risk
- Fast
- Spread By
- Rain splash of conidia, infected seed tubers, wind-driven rain
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Symptoms: What does Yam Anthracnose look like?
Visual identification guide — tap each stage for details
Small brown spots on leaf tips and margins
Small (3-5 mm) brown spots appear on leaf tips and margins. Spots have darker brown borders and may have a yellow halo.
Expanding necrotic lesions and vine dieback
Lesions expand and merge, creating large necrotic areas. Petioles and vine stems develop dark sunken lesions that may girdle the vine, causing dieback from the tips. Salmon-pink spore masses (acervuli) may be visible on lesions.
Severe defoliation and tuber yield loss
Massive defoliation during the critical tuber bulking period. Vines die back extensively. Tuber yield is reduced 80-100% in severe cases. Tubers may also develop surface lesions affecting storage quality.
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