Glenn Ahrens

Forestry

Office Phone
503-655-8631
Location
Clackamas County Extension
Hood River County Extension
Marion County Extension

Contact Glenn Ahrens

Content by Glenn Ahrens

Are there insect issues with birch trees?

Featured Question

Are there insect issues with birch trees?

Is it true that white paper birch in the Willamette Valley have been infested with insect like beetle? I wanted to plant one this spring and my yard maintenance service told me I should consider a different type due to the insect problem.

By Glenn Ahrens

Identifying and Managing Mountain Beaver Damage to Forest Resources

OSU Extension Catalog

Identifying and Managing Mountain Beaver Damage to Forest Resources

The mountain beaver is a medium-sized rodent of the western Pacific Northwest. Mountain beavers cause damage to forest regeneration by clipping or girdling seedlings or saplings or both, and undermining roots. Methods to control mountain beaver include trapping, toxicants, exclusion, repellents, and...

By Glenn Ahrens

A Guide to Riparian Tree and Shrub Planting in the Willamette Valley: Steps to Success

OSU Extension Catalog

A Guide to Riparian Tree and Shrub Planting in the Willamette Valley: Steps to Success

A step-by-step guide to riparian tree and shrub planting in the Willamette Valley. Provides information on project planning, plant materials, site preparation, planting techniques, site maintenance, and monitoring and evaluation. Intended to help landowners, watershed council members, agency...

By Glenn Ahrens, Max Bennett, Brad Withrow-Robinson