living organism detrimental to humans or human concerns From Wikipedia, the free encyclopedia
A pest is an animal which harms humans or human concerns.[1] It is a loosely defined term; it overlaps with the terms vermin, weeds, parasites and pathogens. In its broadest sense, a pest is a competitor of humanity.[2]
According to BBC News Science & Environment, these are among the top ten pests of plants: [3] Fungi are prominent in their list, and it is more usual to call them pathogens.