Diagnosis Complete
Septoria Leaf Spot
Analyzed April 29, 2026
Primary Diagnosis
Septoria Leaf Spot
moderate
Confidence82%
Diagnostic note
Lesion morphology strongly indicates Septoria lycopersici on tomato. The distinct dark margins, tan centers with visible pycnidia, and preference for older foliage are characteristic. Early Blight remains a differential due to similar host and timing, but lacks the concentric ring pattern typical of Alternaria. Disease progression appears moderate with significant leaf area affected but plant structure still intact.
What the AI detected
- circular to angular tan/brown lesions with dark borders
- lesions distributed across older lower leaves
- yellow chlorotic halos surrounding spots
- some lesion coalescence visible
- dark pycnidia visible in center of some spots
Alternative possibilities
#1Septoria Leaf Spot
82%#2Early Blight (Alternaria)
12%#3Bacterial Speck
6%Treatment plan
- 1Remove and destroy affected lower leaves immediately
- 2Apply copper-based fungicide every 7-10 days
- 3Avoid overhead irrigation to reduce leaf wetness
- 4Improve air circulation through proper plant spacing
- 5Mulch around base to prevent soil splash
Treatment guidance informed by published plant pathology research.
Treatment informed by peer-reviewed plant pathology research · Explore studies at consensus.app