Water vole

The water vole (Arvicola terrestris) is a semi-aquatic rodent belonging to the Cricetidae family, often mistaken for a large rat due to its size and appearance.

Adults reach a body length of 12 to 22 cm, with a short, furry tail and rounded ears that are mostly hidden within their thick, dark brown or black fur.

Unlike true rats, water voles have a blunt, rounded muzzle and smaller eyes, which are distinct morphological features of this species.

They are excellent swimmers but also spend significant time burrowing in soil, often creating extensive tunnel systems near water sources or in gardens.

Their front incisors are adapted for gnawing through tough woody roots and bark, allowing them to exploit food sources inaccessible to many other rodents.

Water voles are notorious for causing severe damage to orchards by gnawing the roots and bark of fruit trees, which often leads to the death of young saplings.

They feed on a wide variety of plants, including ornamental bulbs, tubers, and vegetable crops like carrots, potatoes, and beets kept in the soil.

In winter, when green vegetation is scarce, they shift their diet to tree bark, often girdling the trunks near the ground, which kills the affected trees.

They create large underground storage chambers where they hoard significant quantities of harvested vegetables, impacting crop yields considerably.

The tunnels created by water voles disturb the soil structure and damage the root systems of lawns and perennial flower beds throughout the growing season.

Activity begins in early spring as soon as the ground thaws, when individuals emerge from their winter tunnels to feed on fresh, nutritious roots.

The peak reproductive period occurs during summer, leading to rapid population growth and increased pressure on garden crops during the vegetative phase.

Autumn is a period of intense activity as they forage for storage, leading to noticeable losses in vegetable patches as the season comes to an end.

Winter does not halt their activity; they continue to gnaw on tree roots and bark under the snow cover, making them a year-round threat to gardens.

Their activity levels are highest in areas with dense vegetation or moist soil, which provides them with cover and easier digging conditions.

The most common sign is the presence of holes in the ground, usually 5-8 cm in diameter, often accompanied by fresh soil piles or open tunnels.

Visible trails through the grass, leading from water bodies to garden beds, indicate their migration routes and daily foraging paths.

Plants that suddenly wilt or can be easily pulled out of the soil are a clear indication that their roots have been destroyed by a vole.

Girdling or bite marks on the lower stem or roots of woody plants serve as unmistakable evidence of a water vole infestation in the orchard.

• Subterranean tunnels that cause soil to collapse in localized areas.
• Small piles of roots and greens stored near burrow entrances.
• Gnawed bark on the root collar of fruit trees.

Mechanical control using traps set within active tunnels is a common method for small-scale infestations, requiring precise placement to be effective.

Rodenticides can be used, but they must be applied directly into the burrows, with the holes subsequently covered to protect pets and local wildlife.

For long-term protection, surrounding new tree roots with fine-mesh wire cages prevents rodents from reaching the vital parts of the plant.

Maintaining a tidy garden by removing tall grass and debris eliminates the protective cover that voles rely on to move safely through the landscape.

Encouraging the presence of natural predators, such as owls and various carnivores, helps to keep the local vole population in check naturally.