biology

Barley stripe rust

Barley stripe rust is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Barley stripe rust rather than just read about it. In short: Barley stripe rust is a fungal disease of barley caused by Puccinia striiformis f. sp. hordei. a forma specialis of Puccinia striiformis. It was first detected in the United States in 1991, in northern and eastern Idaho in 1993, In 1995 it was detected for the first time in western Washington and western Oregon and is currently considered to be well established there.

Key takeaways

Barley stripe rust belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Barley stripe rust to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Barley stripe rust from memory before moving on to harder problems.

Reference excerpt

Barley stripe rust is a fungal disease of barley caused by Puccinia striiformis f. sp. hordei. a forma specialis of Puccinia striiformis. It was first detected in the United States in 1991, in northern and eastern Idaho in 1993, In 1995 it was detected for the first time in western Washington and western Oregon and is currently considered to be well established there. The disease initially develops at a small loci within a field and spreads rapidly and has caused significant losses in areas where climatic conditions are cool and wet.

Symptoms Infections produce linear, orange-yellow pustules appear on leaves and/or heads. As the disease progresses, pustules coalesce to form long stripes between leaf veins. On susceptible cultivars, entire leaf blades may be covered with pustules. The black spore stage develops as linear black pustules covered by the leaf epidermis.

Disease cycle Puccinia striiformis f. sp. hordei, is an obligate parasite that overseasons on volunteer barley or rye, certain wild barleys such as Hordeum jubatum (foxtail barley), wheat, and numerous perennial grass species. The disease begins from a very small number of infections that are difficult or impossible to detect in the field. Spread of the pathogen can be explosive and cause significant losses, especially in the Pacific Northwest where cool, wet weather greatly favors disease development.

Management The disease can be managed by growing disease resistant cultivars. Foliar fungicides may be required when growing a susceptible cultivars.

External links Chen, X.M.; R.F. Line; H. Leung (1995). "Virulence and polymorphic DNA relationships of Puccinia striformis f.sp. hordei to other rust" (PDF). Plant Dis. 85: 1334–1342. Archived from the original (PDF) on 2007-09-29. Retrieved 2007-02-22. Chen, X.M.; R.F. Line (1999). "Recessive genes for resistance to Puccinia striiformis f. sp. hordei in barley". Phytopathology. 89 (3): 226–232. doi:10.1094/PHYTO.1999.89.3.226. PMID 18944763. Marshall, D.; R.L. Sutton (1995). "Epidemiology of stripe rust, virulence of Puccinia striiformis f.sp. hordei and yield loss in barley" (PDF). Phytopathology. 79 (7): 732–737. doi:10.1094/pd-79-0732. Archived from the original (PDF) on 2007-09-29. Retrieved 2007-02-22.

References

Worked examples

Example 1 — a first encounter with Barley stripe rust

Start with the simplest possible case. Write down what Barley stripe rust claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Barley stripe rust before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Barley stripe rust ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Barley stripe rust

In research: Barley stripe rust appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Barley stripe rust in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Barley stripe rust is common in secondary-school and first-year university syllabi. It links to neighbouring topics Barley diseases, Forma specialis taxa, Fungal plant pathogens and diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Barley stripe rust outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Barley stripe rust in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Barley stripe rust means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Barley stripe rust out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Barley stripe rust in simple terms?

Why does Barley stripe rust matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Barley stripe rust?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Barley stripe rust.