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

Washington’s 2016 Forest Health Highlights

The Washington State Department of Natural Resources and USDA Forest Service conduct annual aerial surveys to identify, map and monitor the impacts of insect and diseases on forest lands throughout the state. Aerial survey data are verified with ground-based observations and are compared against the results of other forest health research happening throughout the state. Survey results are compiled … Continue reading Washington’s 2016 Forest Health Highlights

Potential for Douglas-fir Beetle Outbreaks in Eastern Washington

Several windthrow events in 2015 have paved the way for a potential outbreak of Douglas-fir beetle in areas of eastern Washington this spring (2017). The Douglas-fir beetle is a bark beetle that normally breeds in felled, injured, windthrown or root-diseased Douglas-fir. It may also attack western larch, but can only produce brood in downed trees. … Continue reading Potential for Douglas-fir Beetle Outbreaks in Eastern Washington