Sorghum AnthracnoseIdentification & Treatment Guide 2026
Colletotrichum sublineolum · Family: Glomerellaceae
Sorghum anthracnose (Colletotrichum sublineolum) causes elliptical leaf spots with acervuli, panicle rot, and grain mold. Yield losses reach 30-67% in humid tropics. Manage with resistant varieties, crop rotation with non-host crops, seed treatment with thiram, and foliar application of azoxystrobin at flag leaf if disease pressure is high.
Scan This Plant NowQuick Diagnosis
highSorghum Anthracnose
- Affects
- leavesstalkspaniclesgrain
- Peak Season
- Mid to late season during warm (25-30°C) humid weather, especially during grain fill
- Spread Risk
- Moderate
- Spread By
- Rain splash of conidia, wind-driven rain, infested seed, crop debris
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Symptoms: What does Sorghum Anthracnose look like?
Visual identification guide — tap each stage for details
Small circular reddish-tan spots on lower leaves
Small (2-5 mm) circular to elliptical spots with tan centers and reddish-purple margins appear on lower leaves.
Expanding elliptical lesions with acervuli
Lesions enlarge to 1-4 cm, becoming elliptical. Small dark fruiting bodies (acervuli) are visible in the center of older lesions, often with setae (dark hair-like structures) visible with a hand lens.
Panicle rot and grain mold
Panicle infection causes reddish discoloration of rachis branches and grain mold. Infected grains are discolored, shrunken, and may be covered with fungal growth. Stalk rot phase causes lodging.
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