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Mammals

Voles

Photo: Roger Barbour
A meadow vole.

Description & Identification

Several species of voles are found in Illinois. Voles are small, stocky rodents. They are approximately four and a quarter to seven inches in length and weigh 25 to 50 grams, depending on the species. They have grizzled brown to reddish-brown fur, short legs and small, furred ears. They can be distinguished from mice by their stocky body shape and their short tails (typically less than one-third of the length of their body). Meadow voles and woodland voles are the species most likely to cause problems in Illinois.

Photo: Michael Jeffords
Prairie vole eating a stem.
Prairie vole
Woodland vole
Photo: Roger Barbour
A meadow vole.
Meadow vole

 

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Size Comparison

Illustrator: Lynn Smith
Man and small rodent illustration
Size comparison between a six-foot tall man, shrew, mouse and vole. Voles are larger than shrews or mice. Voles have short tails, while mice have long tails.

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Distribution & Abundance

Prairie and woodland voles are common throughout Illinois. The meadow vole is common in the northern two-thirds of the state.

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Behavior & Ecological Role

The stems of vegetation are cut cleanly on a 45 degree angle. Meadow voles sometimes build a nest of grass above ground, whereas the other species build nests below ground.

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Diseases & Public Health

Voles do not often come into contact with people and are not considered a public health threat.

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Habitat & Food

Meadow voles inhabit grasslands in low-lying areas or near stream, lakes, or swamps. Prairie voles live in upland grasslands, fallow fields, and fencerows and typically avoid wooded areas. Woodland voles inhabit deciduous forests and grassy areas near woody areas.

Voles are herbivores (eat plants). They feed heavily on grasses, sedges, alfalfa, goldenrod, clover and plantain. They will also eat grains, seeds, berries, bulbs, and occasionally insects or snails. When other foods are limited, voles will eat bark from the base of trees and shrubs. This behavior often occurs during the winter in Illinois.

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Reproduction & Longevity

Female voles can have several litters during a year. Meadow and prairie voles have an average of three to five young per litter. Woodland voles average two to three young per litter. Females can begin breeding at three weeks of age.

Voles have a very short lifespan, most living less than one year. They are a major food source for foxes, hawks, snakes, and many other predators of small mammals.

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Damage Prevention & Control Measures

Voles are more often a problem in agricultural fields and orchards than in the urban landscape. Young orchard trees are particularly susceptible to vole damage during the winter when voles feed on bark and tree roots. Voles can kill trees if they girdle them or cause extensive root damage.

However, voles can become a problem for homeowners, if they severely damage garden or landscaping plants. Voles may feed on bulbs, tubers and corms, especially during the winter. Because voles often use the tunnel systems of moles, moles are sometimes blamed for damage actually caused by voles.

Voles may clip grass and create surface runways in lawns under a layer of snow. The trail systems disappear quickly once the grass begins to grow in the spring and the lawn is not harmed.

Rabbits will also gnaw on bark, especially during the winter. To determine whether or not voles are causing the damage, look for irregular gnaw marks and note their width. Voles gnaw on bark from various angles and make marks approximately 1/8 inch wide, 3/8 inch long, and 1/16 inch deep. Rabbit gnaw marks are wider and longer, and rabbits often clip off small branches at a 45 degree angle.

Habitat Modification

Habitat modification is the best way to control vole damage. Keeping grass mowed short will reduce food resources and cover, that will reduce vole numbers in the area. Mulch should be kept at least three inches away from the base of trees.

Exclusion

Small gardens, flower beds or favorite plants can be protected from vole damage by using an underground barrier. Bury one-quarter inch or less mesh hardware cloth six to eight inches into the soil around the area you wish to protect.

Surrounding trees or shrubs with hardware cloth or a tree protector that has openings one-quarter inch or less can protect them. The protector must be flush with the ground so that the voles cannot squeeze in underneath the protector.

Repellents

Thiram applied to roots or tubers before planting may help protect plants from vole damage, but this strategy provides only short-term protection.

Toxicants

Zinc phosphide baits and anticoagulants (Chlorophacinone and Diphacinone) may be used to control voles in Illinois. The zinc phosphide baits should be placed in runways and burrow openings. The baits should not be broadcast, because they are potentially hazardous to ground-feeding birds. Toxicants may only be used by licensed pesticide applicators. Read and follow the instructions on the product label.

Recommendations for the control of voles in Illinois’ commercial apple orchards are available HERE. The common and scientific names of the pine vole (Pitymys pinetorum) were changed to woodland vole (Microtus pinetorum) since the article was written.

Removal

Mouse snap traps can be used to remove a small number of voles. However, due to their reproductive capabilities, it is typically ineffective to trap voles over a large area. The traps should be set perpendicular to the vole runway with the trigger end placed in the runway.

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