RiceHigh field risk
Rice blast
Magnaporthe oryzae
A fungal disease affecting leaves, nodes and panicles, favoured by susceptible varieties and prolonged leaf wetness.
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.
- Spindle-shaped lesions with pale centres
- Darkened nodes
- Partially filled or blank panicles after neck infection
Field checks before treatment
- 1Confirm symptoms before applying any fungicide
- 2Avoid excess nitrogen
- 3Follow locally registered product labels if treatment is recommended
Reduce future risk
- Use resistant varieties
- Balance fertilizer inputs
- Manage planting density and crop residue
Irrigation note
Keep irrigation consistent with the production system. Avoid extended crop stress and unnecessary canopy 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.