European pine vole

The European pine vole (Microtus subterraneus) is a small rodent belonging to the Cricetidae family. It is distinct from other voles due to its compact body and dark, brownish-grey fur.

This species is well-adapted for a subterranean lifestyle. It features tiny ears that are barely visible and small, functional eyes, reflecting its primary life in tunnels and burrows beneath the soil surface.

Adult individuals typically measure around 8 to 10 centimeters in length. Despite their small stature, they are highly capable of moving through the top layers of soil and leaf litter.

The reproduction rate of this species is quite high. A single female can produce several litters within one growing season, facilitating rapid population expansion in suitable habitats.

Young voles develop quickly and begin independent foraging shortly after weaning, allowing them to establish their own burrows and contribute to the growth of the local colony.

The European pine vole is a significant agricultural pest known for attacking a wide range of cultivated crops, especially those with root systems or subterranean parts.

In orchards and nurseries, these voles often gnaw the bark of tree trunks at the root collar level, which disrupts nutrient transport and frequently results in the death of young saplings.

Vegetable crops, particularly tubers and root crops like carrots, potatoes, and beets, are frequent targets. The voles excavate deep cavities in these vegetables, rendering them unsellable.

Cereal crops are also at risk. During autumn and winter, voles can extensively damage the root systems of winter grains, often leading to patchy fields and significant yield losses.

Grasslands and forage crops suffer as well, as the voles clip the base of plants. This activity can thin out pastures, reduce hay quality, and hinder the regeneration of important grasses.

Detecting the presence of the European pine vole is challenging because most of their activity occurs underground. However, small burrow entrances, often hidden by debris, are a key indicator.

Small mounds of soil pushed to the surface are common signs of tunnel construction. Over time, you may also observe shallow, linear depressions in the soil representing their travel paths.

In orchards, after the snow melts, one may find ring-shaped bark damage near the base of the trees. This is a tell-tale sign of vole activity that occurred during the winter months.

On grain fields, patches of prematurely withered or «mown» vegetation indicate where the voles have been feeding. In such areas, stems are often cut cleanly near the base.

The accumulation of droppings near the burrow entrances and the presence of well-worn trails under thick vegetation are additional signs that a colony is active in the area.

Deep autumn plowing is the most effective mechanical method for controlling this pest. It destroys the network of tunnels and exposes the rodents to environmental stressors and predators.

Keeping the field edges and orchards free from excessive weeds and tall grass is essential, as these areas provide cover and food that sustain the vole population during off-seasons.

Physical protection, such as wire mesh guards around the base of young tree trunks, is a standard and highly effective practice for preventing bark damage in fruit orchards.

When populations exceed economic thresholds, the use of rodenticides is an option. These must be applied carefully inside the burrows to ensure efficacy and avoid harming non-target wildlife.

Encouraging natural predators, such as owls and hawks, by installing nesting boxes or perches can provide a sustainable way to keep vole populations under control in the long term.