Septoria Leaf Spot
A fungal disease of tomato caused by Septoria lycopersici, typically starting on lower, older leaves.
Affected Plant
Tomato
Severity
Moderate
Symptoms
- Small, circular spots with dark margins and light gray-to-tan centers
- Tiny black fruiting bodies visible within spot centers
- Lower leaves affected first
Causes
- Favored by warm, humid weather
- Spread by rain splash and overhead watering
Prevention
- Rotate crops
- Mulch to reduce soil splash
- Remove infected lower leaves
- Avoid overhead irrigation
Management
- Apply fungicide per local extension guidance
- Practice general garden sanitation
Related Tomato Diseases
Think your plant might have Septoria Leaf Spot?
Upload a photo of the affected leaf and get an instant AI diagnosis with a Grad-CAM explanation of what the model saw.
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.