Leaf Blight (Isariopsis Leaf Spot)
A fungal leaf disease of grape caused by Pseudocercospora vitis (also known as Isariopsis leaf spot).
Affected Plant
Grape
Severity
Low to Moderate
Symptoms
- Angular brown to black leaf spots
- Premature defoliation in severe cases
Causes
- Fungal spores spread by rain splash
- Warm, humid conditions favoring infection
Prevention
- Manage canopy for good airflow
- Remove and dispose of fallen infected leaves
Management
- Apply fungicide if disease pressure is high, per local extension guidance
Related Grape Diseases
Think your plant might have Leaf Blight (Isariopsis 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.