Article by Glenn Kohler, DNR Forest Entomologist This spring and summer, the Washington State Department of Natural Resources (DNR) received numerous reports of dead or damaged Douglas-fir trees throughout the state. Symptoms include entirely red crowns in saplings and red tops or scattered red branches in trees. The damage is more common in dry lowland … Continue reading Douglas-fir Damage May Be Caused by Secondary Bark Beetles
The City of DuPont (pop. ~8,200) is a planned community in Pierce County, WA, that was built out between 1994 and 2008. In the course of development, roughly 7,000 trees were installed in 5-foot wide planting strips located between the street and sidewalk, all within the public right of way. In recent years, sidewalks in … Continue reading From the Field: DuPont Repairs Sidewalks, Saves Trees
Mulch serves many important functions. Shredded wood chips and other coarse-textured, biodegradable mulches help to build and protect soil, buffer drought conditions, and support healthy tree growth. Mulch: Retains soil moisture Moderates soil temperatures Reduces competition from weeds and grass Minimizes soil compaction Prevents erosion Returns nutrients to the soil as mulches break down slowly … Continue reading Timely Tree Tips — Much ado about Mulching
Spring is just around the corner, and with that comes the emergence of fresh green leaves and the bright blooms of flowering trees and shrubs. In early spring--that is to say RIGHT NOW--trees are tapping energy reserves from the previous growing season to activate buds throughout the tree canopy. As the tree streams sap (energy) … Continue reading Timely Tree Tips — Perils of Early Spring Pruning
This article reprinted as it originally appeared in DNR's Forest Stewardship Notes In the forest, trees exist in many life phases simultaneously, from seedlings to giants, and then as standing dead trees (snags) and down logs. Natural forces constantly work on trees, causing them to grow, then die, crack, and rot. The individual fate of … Continue reading How to Make a Wildlife Tree
This article written by Susan Sanders, urban forestry commissioner and tree steward for the Carter Park Neighborhood, City of Vancouver, WA. I have a huge, old ponderosa pine in my front garden in Vancouver, Washington. With all the news reports about trees falling during storms, I have worried if my tree is at risk of being … Continue reading A Tall Tree Tale: Is my large tree a problem?
It may feel like summer has barely arrived but the fall planting season is just 10 weeks away. This is a fitting time to get familiar with industry accepted standards for nursery stock (if you aren't already). The American National Standards Institute's Z.60, American Standard for Nursery Stock establishes professional standards for trees and shrubs grown in the … Continue reading Timely Tree Tips — Standards for Nursery Stock