Discussion
Match the following rice diseases in Group I with their causal agents in Group II.
Group I: (P) Blast; (Q) False smut; (R) Sheath blight; (S) Downy mildew
Group II: (1) Sclerophthora macrospora; (2) Rhizoctonia solani; (3) Ustilaginoidea virens; (4) Puccinia graminis; (5) Magnaporthe grisea
Answer: A
The match is P-5; Q-3; R-2; S-1.
- Rice blast is caused by the fungus Magnaporthe grisea (Magnaporthe oryzae, anamorph Pyricularia).
- False smut, which turns grains into greenish smut balls, is caused by Ustilaginoidea virens.
- Sheath blight is caused by Rhizoctonia solani.
- Downy mildew of rice is caused by the oomycete Sclerophthora macrospora.
Puccinia graminis, the stem rust of wheat, is the distractor: it does not cause any of these rice diseases, so every option using item 4 is wrong.
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