WheatHigh field risk
Wheat stem rust
Puccinia graminis f. sp. tritici
A wind-borne rust that can spread rapidly across susceptible wheat when conditions are favourable.
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.
- Elongated reddish-brown pustules on stems or leaves
- Torn epidermis around pustules
- Dark resting spores later in the season
Field checks before treatment
- 1Report unusual outbreaks quickly
- 2Check current local rust advisories
- 3Use only locally registered controls when advised
Reduce future risk
- Plant resistant varieties
- Remove volunteer wheat where recommended
- Monitor from stem elongation onward
Irrigation note
Schedule irrigation to reduce prolonged humid canopy conditions while preventing crop water stress.
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.