The damaging stage of locust is

Solution(By Examveda Team)

The damaging stage of locust is Nymph and adult.
Locusts are various species of short-horned grasshoppers in the family Acrididae that have a swarming phase. These insects are usually solitary, but under certain circumstances they become more abundant and change their behaviour and habits, becoming gregarious.
Locusts do the most damage at the flowering stage or when they settle on bushes in such large numbers that their weight breaks the branches. These are particularly vulnerable to attack by immature swarms which have a preference for roosting in trees.