(d) lac insect
[CBSE AIPMT 1997]
Correct Option (c)
Reason : Pebrine disease is one of the most damaging disease of silkworm. It is caused by Nosema bombycis nageli. The other diseases of silk worm are Flacherie which is an infectious viral disease marked by body flaccidity and digestive disorders.
Muscaridine, which is a fungal disease caused by Spicaria or Botrytis.