Carpet beetle larvae damaging a specimen of Sceliphron destillatorius in an entomological collection

The term pest may be used to refer specifically to harmful animals but is also often taken to mean all harmful organisms including fungi and viruses. Pesticides are chemicals that are used to control or protect other organisms from pests.

It is possible for an animal to be a pest in one setting but beneficial or domesticated in another (for example, European rabbits introduced to Australia caused ecological damage beyond the scale they inflicted in their natural habitat). Many weeds are also seen as useful under certain conditions, for instance Patterson's curse is often valued as food for honeybees and as a wildflower, even though it can poison livestock.

The concept of a pest is anthropogenic, based on human purposes and perceptions.

Related is pestilence, which is any highly-infectious (epidemic) disease.

See also

• Invasive species
• List of common household pests
• Woodboring beetle
• Pest control
• Pests and diseases of roses
• Vermin
• Weed

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