Tomato Early BlightIdentification & Treatment Guide 2026
Alternaria solani · Family: Pleosporaceae
Tomato early blight is caused by the fungus Alternaria solani. It produces dark brown spots with concentric rings on lower leaves, spreading upward. Manage with crop rotation, resistant varieties, mulching to prevent soil splash, and fungicide applications of chlorothalonil or copper-based products when symptoms first appear.
Scan This Plant NowQuick Diagnosis
moderateTomato Early Blight
- Affects
- leavesstemsfruit
- Peak Season
- Warm humid months (20-30°C), typically mid to late growing season
- Spread Risk
- Moderate
- Spread By
- Rain splash, wind, contaminated seed, infected plant debris in soil
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Symptoms: What does Tomato Early Blight look like?
Visual identification guide — tap each stage for details
Small dark spots on lower leaves
Initial symptoms appear as small (1-2 mm) dark brown to black spots on the oldest, lowest leaves of the plant.
Concentric ring pattern (target spots)
Lesions enlarge to 1-2 cm with distinctive concentric rings forming a target or bull's-eye pattern. Yellow halos develop around lesions.
Severe defoliation and fruit lesions
Extensive leaf yellowing and drop. Dark, sunken, leathery lesions appear at the stem end of fruit. Stems develop dark elongated cankers.
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