Emerging Issues with Western Hemlock and Douglas-fir

As the seasons change and the weather warms, DNR Forest Health staff tend to get more inquiries about tree health issues across the state. Some issues such as root diseases or Douglas-fir bark beetle mortality are relatively common, while others are less common but equally attention-getting. The latter includes red and dead branches, red and … Continue reading Emerging Issues with Western Hemlock and Douglas-fir

Achieving Healthy Eastern Washington Forests within 20 Years

Throughout the western United States, including Washington state, the health of our forests has been in decline for several decades. This means that our forests are less able to provide ecological functions, less sustainable, less resilient, less able to meet land manager objectives and less resistant to invasive species, insects, diseases and fire. How We … Continue reading Achieving Healthy Eastern Washington Forests within 20 Years

Blue Spruce Damage Indicates Elevated Risk of Douglas-fir Tussock Moth Outbreak

Recently, I have begun to observe damage to ornamental blue spruce throughout the area of Colville, Washington. Upon closer inspection of these trees, I found that they are being defoliated by the Douglas-fir tussock moth. The Douglas-fir tussock moth is a native defoliator of Douglas-fir, true firs (such as grand fir) and spruce. For reasons … Continue reading Blue Spruce Damage Indicates Elevated Risk of Douglas-fir Tussock Moth Outbreak

Habitat Logs: How to Help the Creepy Crawlies on the Forest Floor

The following article was originally published in DNR's "Forest Stewardship Notes" to encourage small forest landowners to consider techniques that provide wildlife habitat and restore ecosystems, however the same principles apply in urban landscapes. It is worth noting that habitat logs can also serve a valuable purpose for absorbing and retaining stormwater runoff.  The forest … Continue reading Habitat Logs: How to Help the Creepy Crawlies on the Forest Floor

Ponderosa Pines Killed by Western Pine Beetle on the Rise

The western pine beetle (WPB), Dendroctonus brevicomis, is a native bark beetle found in eastern Washington that can kill ponderosa pine, its only host in the state. In typical years, low populations of WPB attack trees that are old and decadent, weakened, or plagued by root diseases such as armillaria. But, when trees experience severe … Continue reading Ponderosa Pines Killed by Western Pine Beetle on the Rise

State Asks You to Check Trees for Invasive Pests in August

The Washington Invasive Species Council and a consortium of agencies and universities are asking residents to check trees and swimming pools in their yards for harmful bugs as part of the national Tree Check Month in August. August is the peak time of year to find invasive bugs like citrus longhorned beetles, emerald ash borers … Continue reading State Asks You to Check Trees for Invasive Pests in August