In paddy, the elongation of leaf sheath, when infested by gall fly (Orseolla oryzae) is due to a chemical known as

Solution(By Examveda Team)

In paddy, the elongation of leaf sheath, when infested by gall fly (Orseolla oryzae) is due to a chemical known as Cecidogen.
The active substance, cecidogen secreted from the saliva of gall midge larva and the larval feeding on the meristematic tissue of terminal and auxiliary shoot apices in rice plants are responsible for gall formation (silver-shoot) in rice.
Orseolia oryzae, also called the Asian rice gall midge, is a species of small fly in the family Cecidomyiidae. It is a major insect pest of rice.