what is a pest?
A pest species is one that humans consider undesirable. This definition covers a multitude of sins: mosquitoes are pests because they carry diseases or because their bites itch; Allium spp. are pests because when harvested with wheat these weeds make bread taste of onions; rats and mice are pests because they feast on stored food; mustellids are pests in New Zealand because they are unwanted invaders that prey upon native birds and insects; garden weeds are pests for esthetic reasons. People want rid of them all.
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