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Damage to conifer regeneration by mountain beavers, more commonly called boomers, results in significant losses in Western Oregon annually. Most of the damage is to 1- to 5-year-old conifer seedlings. Where populations are high, repeated clipping by mountain beavers can cause loss of production through poorly stocked acres-even reforestation failures.
Damage can continue on saplings up to 15 to 20 years old; however, newly planted seedlings are particularly vulnerable. In a few instances, extensive burrowing can undermine the roots of larger trees enough to topple them.
This publication will help you design a program to reduce mountain beaver damage in your forest plantations to acceptable levels. First, we discuss mountain beaver biology to familiarize you with some of the animal's behavior; this will help you control its damage. Then we discuss control techniques.
Finally, we discuss integrating control methods with silvicultural practices as a way to maximize the effect of your control program.