Multiple choice

Which of the following organisms causes blast disease of rice?

  1. Verticillium species

  2. Magnaporthe grisea

  3. Sclerotinia sclerotiorum

  4. Armillaria species

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Magnaporthe grisea causes rice blast disease. Initial symptoms are white to gray-green lesions or spots with darker borders produced on all parts of the shoot, while older lesions are elliptical or spindle-shaped and whitish to gray with necrotic borders. Lesions may enlarge and coalesce to kill the entire leaf.