Question

Damping off, the most serious disease in forest nurseries caused by
(A) Pythium sp. (B) Fusarium sp. (C) Rhizoctonia solani (D) Xanthomonas spp.
Choose the correct answer from the options given below:

• A. (A), (B) and (D) only.
• B. (A), (C) and (D) only.
• C. (A), (B) and (C) only.
• D. (B), (C) and (D) only.

Hint:

Damping-off is a fungal/oomycete disease, not a bacterial one.

Answer 1

The Correct Option is C

Damping-off, one of the most destructive diseases seen in forest and other plant nurseries, is caused mainly by soil-borne fungal and oomycete pathogens, chiefly Pythium, Fusarium and Rhizoctonia solani, all of which attack young seedlings right at or just below the soil surface.
Xanthomonas is a bacterial genus, and bacteria aren't typically part of the damping-off disease complex, which is essentially fungal and oomycete in nature.
So the correct causal agents are (A), (B) and (C), matching option 3.