Haunglongbing (Citrus Greening)
A serious bacterial disease of citrus caused by Candidatus Liberibacter species and spread by the Asian citrus psyllid. It is more commonly spelled "Huanglongbing" (HLB) in agricultural literature.
Affected Plant
Orange
Severity
High
Symptoms
- Blotchy yellow mottling of leaves, often asymmetric across the midrib
- Stunted tree growth
- Small, lopsided, bitter-tasting fruit with aborted seeds
- Twig dieback
Causes
- Bacterial infection transmitted by the Asian citrus psyllid insect vector
- Spread via infected grafting or propagation material
Prevention
- Control psyllid vector populations
- Use certified disease-free planting material
- Remove and destroy infected trees to limit spread
Management
- No cure is currently available; management focuses on vector control and orchard sanitation
- Consult local agricultural authorities, as this disease is a regulated/quarantine concern in many regions
Think your plant might have Haunglongbing (Citrus Greening)?
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.