CDFA Pest Prevention Plant Regulation Practice Exam

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What type of organism is responsible for black stem rust?

  1. A. virus

  2. B. bacteria

  3. C. fungus

  4. D. insect

The correct answer is: C. fungus

Black stem rust is caused by a specific type of fungus known as Puccinia graminis. This fungus infects various species of plants, particularly wheat, and is notorious for causing significant agricultural damage. The life cycle of this pathogen includes a series of spores that can effectively spread, leading to widespread infection in crops. Understanding that black stem rust is a fungal disease is crucial for implementing proper disease management strategies, such as the use of resistant plant varieties and suitable fungicides to protect crops from this serious threat. The other organisms listed—viruses, bacteria, and insects—play different roles in plant pathology, but they are not the causative agents of black stem rust.

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