U.S. Department of Agriculture: Animal and Plant Health Inspection Service

 

Document Type

Article

Date of this Version

July 2003

Comments

Published by WESTERN FORESTER JULY/AUGUST 2003.

Abstract

Damage to trees in the Pacific Northwest ecosystems can occur at any point in a tree’s development. Of the three genera of voles, Microtus is the largest and most destructive to western forest ecosystems. Voles, like many small rodent species, have the ability to produce numerous litters in a single year and females are mature 30-40 days after they are born. Average litter size is three pups, and females can a produce a litter every 21 days. With this type of reproductive capability, it is easy to see why vole populations can rapidly expand in ideal habitats.

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