Forest dormouse

The forest dormouse (Dryomys nitedula) is a small rodent belonging to the family Gliridae. Recognized by its distinct black eye mask and fluffy tail, this nocturnal mammal is primarily arboreal. While often perceived as a curious forest inhabitant, its presence near agricultural areas can lead to significant economic losses in horticulture.

This species is considered a pest in orchards, vineyards, and commercial plantations. It feeds on various parts of fruit-bearing trees, including flower buds, young shoots, and ripening fruits. Crops such as apples, pears, plums, apricots, and grapes are particularly susceptible to their feeding habits, especially during the pre-harvest period when the dormice forage to build fat reserves.

The biology of Dryomys nitedula is characterized by seasonal hibernation, which typically begins in late autumn and ends in early spring. Following hibernation, the animals enter a breeding phase. The female typically raises one or two litters per year. Their rapid metabolic rate during the active summer season necessitates frequent feeding, leading to increased damage to fruit crops.

The damage caused by the forest dormouse is often identified by specific gnaw marks on fruit. They frequently hollow out fruits to access seeds, causing premature fruit drop and susceptibility to secondary fungal infections. Furthermore, their gnawing of young bark can cause localized tissue death in branches, which may stunt the growth of young saplings or fruit-bearing trees.

Effective management strategies focus on deterrence and physical exclusion. Installing cone-shaped metal guards around the trunks of fruit trees is a highly effective way to prevent the dormice from climbing into the canopy. Additionally, maintaining a clean orchard floor, pruning overhanging branches near structures, and encouraging the presence of natural predators like owls can significantly reduce the pressure from these rodents on your harvest.