Article

Tree Pruning Basics

A properly pruned tree looks as natural as possible; that is to say, the tree’s appearance reflects its fundamental form and character. The pruner must be sensitive to maintaining this structural integrity, in addition to knowing a bit about tree biology and proper pruning principles!

Featured Question

Can you identify this black and white bug?

I have lived in Oregon all my life and never seen this kind of bug before, what is it? It's not very fast moving, this one wasn't anyway.

Featured Question

How can I get my clothes unsapped?

How do I get pine sap off of clothing?

By Francisca Belart

Online Resource

International Society of Arboriculture (ISA) - Pacific Northwest Chapter

The Pacific Northwest Chapter of the International Society of Arboriculture (PNW-ISA) is a member organization for arborists and urban foresters. We bring together professionals from Alaska, Idaho, Oregon, Washington, and British Columbia. Since 1979, we have been a resource and advocate for the green industry.

Featured Question

What is up with this tree?

We had a viewer send in this photo of a tree in Cedar Canyon near Banks, Oregon. We posted this to the OPB/ Oregon Field Guide Facebook page and now I feel a responsibility to give folks an accurate ID of what is causing this strange formation atop the tree. Mistletoe? Witch's Broom? Something else?...

By Dave Shaw

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

Featured Question

Wild red asparagus, yum or yuck?

Found in numerous places in our garden. Is it poisonous? Would like some additional info. Understand that it is rare.

By Amy Jo Detweiler

Featured Question

How can I save my Aspen?

Can you help me save my Aspen tree? The lower branches turned black which I cut off. Holes in trunk at ground level. Gouges/Scratches at approx 6' above ground level.

By Nicole Strong

OSU Extension Catalog

Oregon Forest Pest Detector Pest Watch—Emerald ash borer (EAB) | Monitoreo y Detección de Plagas Forestales en Oregon—El barrenador verde esmeralda del fresno (EAB)

This is a bilingual publication (English and Spanish) for landscape workers and the public to help them protect Oregon trees and forests from this damaging pest. Includes insect identification, host plants, signs and symptoms, and what to do if you suspect that an insect you've seen is EAB. Esta...

By Amy Grotta, Brandy Saffell

OSU Extension Catalog

Oregon Forest Pest Detector Pest Watch—Asian longhorned beetle (ALB) | Monitoreo y Detección de Plagas Forestales en Oregon—El escarabajo asiático de cuernos largos (ALB)

This is a bilingual publication (English and Spanish) for landscape workers and the public to help them protect Oregon trees and forests from this damaging pest. Includes insect identification, host plants, signs and symptoms, how to spot an ALB (including insects that resemble ALB), and what to do...

By Amy Grotta, Brandy Saffell