CoffeeHigh field risk
Coffee leaf rust
Hemileia vastatrix
A fungal leaf disease that causes premature leaf fall and can weaken production over successive seasons.
Pictorial field guide
Illustrative symptom pattern for physical comparison. Lighting, crop stage and cultivar can change appearance; never diagnose or treat from this picture alone.
Compare several physical signs
Use the diagram to orient a field inspection, then look across multiple plants and both sides of affected leaves before contacting an extension officer.
- Pale yellow spots on upper leaf surfaces
- Orange powdery patches beneath leaves
- Premature leaf drop when severe
Field checks before treatment
- 1Inspect lower leaves across the block
- 2Record incidence over time
- 3Follow local thresholds and registered-control guidance
Reduce future risk
- Use resistant cultivars
- Maintain balanced shade and nutrition
- Prune for airflow and monitor after wet periods
Irrigation note
Use drip or soil-level irrigation where possible and avoid extending leaf wetness.
Open irrigation guideAutomated decision support only. Confirm crop treatments with a qualified extension officer before applying a pesticide, fungicide, removing plants, or changing field treatment. Always follow the product label and local registration rules.