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

Newsletter Issue

Focus On Extension, Volume 19, Issue 5

Description of events that are happening in Clackamas County in October, November, and part of December.

By Michael Bondi, Marcia McIntyre, Erin Devlin, Glenn Ahrens

Front page of Focus On Extension, Vol 19, Issue 4

Newsletter Issue

Focus On Extension, Volume 19, Issue 4

A highlight about what Clackamas County Extension has done in the last two months and what people can look forward to doing in the coming months.

By Michael Bondi, Glenn Ahrens, Peter Matzka, Jan Williams

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

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

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