Why are house mice considered agricultural pests?

House mice (Mus musculus) are considered agricultural pests primarily because they consume and damage crops and seeds, including grains, when living outdoors in areas such as croplands and fallow fields.1

Their status as pests is reinforced by several factors:

• Dietary Habits: As omnivores, they feed on a variety of agricultural products, leading to direct crop loss.1
• Contamination: Beyond consumption, they can contaminate stored food supplies with their waste.2
• Adaptability: Their highly adaptive nature allows them to thrive in man-made habitats. When fields are plowed or crops are harvested, these mice frequently migrate into other fields or nearby buildings, maintaining their presence in agricultural environments.1
• Reproductive Rate: Their rapid rate of reproduction—producing up to 14 litters per year—allows populations to grow quickly, exacerbating the damage they cause to agricultural resources.1

While they are closely associated with humans, their ability to exploit agricultural settings for food and shelter makes them a significant concern for farmers.12