pest

US /pest/
UK /pest/
"pest" picture
1.

plaga, parásito

a destructive insect or other animal that attacks crops, food, livestock, etc.

:
The farmer used pesticides to control the pests in his fields.
El agricultor usó pesticidas para controlar las plagas en sus campos.
Rats and mice are common household pests.
Las ratas y los ratones son plagas domésticas comunes.
2.

fastidio, molestia

a person or thing that causes annoyance or trouble

:
My little brother can be a real pest sometimes.
Mi hermano pequeño puede ser un verdadero fastidio a veces.
Stop being such a pest and let me work!
¡Deja de ser tan fastidioso y déjame trabajar!