Question

Black stem rust of wheat is caused by

• A. Puccinia graminis
• B. Ustilago nuda
• C. Albugo candida
• D. Xanthomonas oryzae

Answer 1

Answer: (A)

Puccinia graminis

Black stem rust of wheat is caused by Puccinia graminis. Crop species, which are affected by the disease include bread wheat, durum wheat, barley and triticale. Puccinia is a genus of fungi. All species in this genus are obligate plant pathogens and cause a disease known as rust. The genus contains about 4000 species. The stem black and cereal rusts are caused by the fungus Puccinia graminis. They are a significant diseases affecting cereal crops.

So, the correct answer is option A.