WSU Extension

Hortsense

Common Insects, Mites & Vertebrates
 
Aphids 
Asian lady beetle 
Bark beetles 
Brown marmorated stink bug 
Brown soft scale 
California gallfly 
Conifer aphids 
Cottony camellia scale 
Cutworms and loopers 
Deer damage 
Earwigs 
Eriophyid mites 
Exotic longhorned beetles 
Fall webworm 
Inchworms 
Leafhoppers 
Leafminers 
Leafrollers 
Lecanium scale 
Oystershell scale 
Pamphilid sawflies 
Pear slug 
Root weevils 
Sapsucker damage 
Shothole borer 
Skeletonizers 
Slugs 
Sowbugs, pillbugs, and millipedes 
Spider mites 
Spotted wing Drosophila (SWD) 
Tent caterpillars 
Voles 



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Caption: Townsend's vole
Photo by: Dave Pehling
  
Common Insects, Mites & Vertebrates : Voles
(revision date: 6/17/2015)


Biology
The Pacific Northwest hosts about 16 vole species. These native rodents are important food sources for hawks, owls and other predators but a few species can cause serious damage to yards and gardens. Most species are skilled diggers and construct tunnel systems for shelter and for feeding on plant roots and bulbs. Voles are generally identified by their small ears, blunt noses, small front feet and relatively short tails. Most species range in size from 5-8 inches in length. Voles feed on a wide variety of mostly grasses and forbs during the summer and on roots, bark and bulbs during the winter. Damage is usually identified easily by the tiny tooth-scars on woody plants. Voles and their early offspring can have several litters over the summer so populations can fluctuate from just a few to several hundred per acre. During high population episodes, damage to plants is severe. Bulbs and roots are often completely eaten over winter and trees can be completely girdled. Most damage is below ground but voles will also tunnel through snow to feed higher on tree trunks. During the spring, feeding moves to the new growth as herbaceous plants sprout and leaf out.
Management Options

Non-Chemical Management
  • Vegetation management is key for managing vole populations: Keep lawns mowed as short as the grass variety allows.
  • Avoid ground covers that provide cover for voles and prune shrubs so branches are not on the ground.
  • Mulch no more than a couple inches deep around plants.
  • "Home remedies" are not consistently effective against voles.
  • Flooding and smoke "bombs" are seldom effective. Both are easily absorbed into the soil.
  • Barriers are somewhat effective deterrents, but are impractical except for small areas and special situations. Hardware cloth (1/4-inch mesh, which will also keep out moles) or other suitable material may be buried beneath the soil (bury 24-30 inches deep, leaving about 6 inches above ground) to discourage vole attacks.
  • Raised beds can be protected by completely screening the bottom of the bed with hardware cloth before filling with soil.
  • Vole repellents have been useful for a time in some instances, but have not shown consistent results in our area.
  • If damage continues, control populations with common mouse traps set in the tunnels and runways. For more information, see the WSU Fact Sheet Vole Management in Home Backyards and Gardens
Select non-chemical management options as your first choice!

Chemical Management

None recommended.

Images

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Caption: Townsend's vole
Photo by: Dave Pehling