Early Blight
A fungal disease of tomato caused by Alternaria solani.
Affected Plant
Tomato
Severity
Moderate
Symptoms
- Dark, concentric-ringed "target" spots, usually on older leaves first
- Yellowing and defoliation
- Dark, sunken lesions on stems and fruit
Causes
- Soil- and debris-borne fungal spores
- Warm, humid weather and plant stress favoring infection
Prevention
- Rotate crops
- Mulch to reduce soil splash onto leaves
- Stake or cage plants for better airflow
- Remove lower infected leaves
Management
- Apply fungicide per local extension guidance
- Practice general garden sanitation
Related Tomato Diseases
Think your plant might have Early Blight?
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Diagnose Your PlantDisclaimer: This is an AI-generated result and not a replacement for expert agronomic or plant-pathology diagnosis. Confidence scores reflect the model's certainty, not biological ground truth. The model was trained and evaluated on leaf photos captured under controlled, lab-like conditions, so accuracy on real-world field photos (cluttered backgrounds, variable lighting, multiple or overlapping leaves) may be lower than the reported evaluation metrics.