Black rust of wheat is caused by
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Black rust of wheat is caused by the fungus Puccinia graminis. The fungus is an obligate parasite. Such disease is characterized by the dark reddish brown pustules on both the sides of leaves, stems and on spikes.
- Puccinia
- Ustilago
- Albugo
- Phytophthora.
The Correct Option is A
Solution and Explanation
Black rust of wheat is caused by Puccinia.
Rust diseases are the most economically significant fungal diseases in wheat and other cereal crops worldwide. Stem rust, also known as black rust, is caused by the fungus Puccinia graminis f. sp. tritici. It infects wheat and other cereals across all U.S. growing regions. The infection causes small brown pustules on the leaf blades that may cause up to 20% yield loss. The plant develops patches if it gets severely affected. It spreads via airborne spores. Several species of this genus like tritici, rubigo-vera cause similar kinds of pathogenicity. Puccinia requires a moist climate to grow.
Therefore, the correct answer is option A.
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Concepts Used:
Biological Classification
The process of grouping living organisms into categories is called biological classification. The most modern 5-kingdom classification was put ahead by an eminent scientist R.H.Whittaker. The five-kingdom classification is based on the criteria like cell structure, mode of nutrition, body form, and reproduction. One of the most important characteristics of this system is that it follows the evolutionary sequence of living organisms. The organisms are classified into distinct taxa or levels like Kingdom, Phylum, Division, Class, Order, Family, Genus, and Species. The 5 kingdoms are as follows:
