Sotto disease of silkworm is caused by

Answer: Option B

Sotto disease of the silkworm is caused by Bacteria.
It is caused by toxin of Bacillus thuringensis. The larvae become unconscious, soft, and darkish and rot off.
It is caused by a virus called Morator Virus which does not form polyhedra in the body of silkworm larvae. The infection occurs mainly through oral cavity.