Plant Disease · Plant disease
Wheat Stripe Rust
Puccinia striiformis
Also known as: Yellow rust
Wheat stripe rust, also called yellow rust, is caused by the fungus Puccinia striiformis. It produces distinctive yellow-orange pustules arranged in stripes along the leaf veins and, unlike some other wheat rusts, can develop and spread under relatively cool conditions.
Stripe rust is caused by Puccinia striiformis, a fungus that includes forms adapted to different cereal hosts, most importantly Puccinia striiformis f. sp. tritici on wheat and Puccinia striiformis f. sp. hordei on barley. The wheat-adapted form is a major cause of yield loss in cool, temperate wheat-growing regions worldwide.
Compared with leaf rust, stripe rust tends to develop at lower temperatures and can spread rapidly during cool, moist spring weather, sometimes appearing earlier in the season than other wheat rusts and reaching damaging levels before conditions warm.
Identification
Stripe rust is identified by its yellow to orange pustules arranged in narrow stripes that run parallel to the leaf veins, a pattern that distinguishes it from the scattered, rounded pustules of leaf rust. Stripes typically appear first on lower, older leaves and progress upward through the canopy as the epidemic develops; in severe cases the fungus can also affect leaf sheaths and spikes.
Biology and disease cycle
Puccinia striiformis produces urediniospores that germinate and infect wheat tissue at cooler temperatures than most other rust fungi, allowing it to establish during cool, humid spring weather while remaining capable of causing damage into the early stages of grain fill. Repeated infection cycles can occur every one to two weeks under favourable conditions.
| Feature | Stripe rust | Leaf rust |
|---|---|---|
| Pustule pattern | Narrow stripes along veins | Scattered round to oval spots |
| Temperature preference | Cooler conditions | Moderate conditions |
| Typical onset | Often earlier in the season | Often mid-to-late season |
Affected hosts
Wheat is the principal host of concern, affected by the tritici forma specialis of Puccinia striiformis. Barley is affected by the related hordei forma specialis of the same fungal species, producing a comparable striped pustule pattern and following broadly similar disease-cycle and risk principles.
Risk factors
- Cool, moist conditions during autumn, winter, or spring growth
- Susceptible varieties, especially where a single resistance gene has become widely deployed
- Dense, lush canopies produced by high nitrogen supply
- New, more aggressive pathogen strains that overcome previously effective resistance genes
- Inoculum arriving from other regions on prevailing winds
Prevention and monitoring
Because stripe rust can establish under cool conditions earlier in the season than other wheat rusts, and because new pathogen strains periodically overcome existing resistance, management emphasises variety choice, surveillance, and timely detection.
- Grow resistant or tolerant varieties recommended for the local region
- Avoid excessive nitrogen that produces dense, highly susceptible canopies
- Follow regional rust forecasting, race-tracking, and survey information from extension or agricultural authorities
- Scout fields regularly from early growth stages onward, especially in cool, humid weather
Relationships
Evidence-backed connections in the knowledge graph.
Risk increases under
Related topics
Scope & limitations
Geographic scope: Global; wheat stripe rust is most damaging in cool, temperate wheat-growing regions and at higher elevations, with severity varying by season and by the resistance genes present in local varieties.
Climate context: Favoured by cool temperatures together with moisture on the leaf surface; can develop earlier in the season, and at lower temperatures, than other wheat rusts.
- This is a general overview and does not replace field diagnosis or region-specific extension guidance.
- Stripe rust pathogen populations change over time and by region, affecting which resistance genes remain effective; consult local authorities for current status.
- Control-product recommendations are jurisdiction-specific and are deliberately not provided here.
Sources
This article draws on the following authoritative sources. See our sources & methodology for how they are selected.
- [1]CABI Digital Library — Crop Protection Compendium (opens in a new tab)High
CABI (Centre for Agriculture and Bioscience International)
Cited for: Pathogen biology, disease cycle, and host range
- Type:
- Reference database
- Jurisdiction:
- Global
- Accessed:
- 2026-07-12
- [2]EPPO Global Database (opens in a new tab)Authoritative
European and Mediterranean Plant Protection Organization (EPPO)
Cited for: Pathogen nomenclature and distribution
- Type:
- Reference database
- Jurisdiction:
- Global
- Accessed:
- 2026-07-12
- [3]CIMMYT — International Maize and Wheat Improvement Center (opens in a new tab)High
International Maize and Wheat Improvement Center (CIMMYT)
Cited for: Global wheat rust monitoring and resistance breeding context
- Type:
- Research institute
- Jurisdiction:
- Global
- Accessed:
- 2026-07-12
- [4]UC Statewide Integrated Pest Management Program (UC IPM) (opens in a new tab)High
University of California Agriculture and Natural Resources (UC ANR)
Cited for: Identification and management principles
- Type:
- University extension service
- Jurisdiction:
- United States (California)
- Accessed:
- 2026-07-12
- [5]AHDB — Agriculture and Horticulture Development Board (opens in a new tab)High
Agriculture and Horticulture Development Board (AHDB)
Cited for: Regional risk factors and monitoring guidance
- Type:
- Government agency
- Jurisdiction:
- United Kingdom
- Accessed:
- 2026-07-12