Pest which occurs regularly and in serious manner is known as

Solution (By Examveda Team)

Pest which occurs regularly and in serious manner is known as Epidemic.
An epidemic is the rapid spread of disease to a large number of hosts in a given population within a short period.
By the early 17^th century, the terms endemic and epidemic referred to contrasting conditions of population-level disease, with the endemic condition at low rates of occurrence and the epidemic condition widespread.