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Keyword: bark beetle

Mountain pine beetles die young in world’s oldest tree species

FS News Posted on: June 28, 2018
A new study found that these trees not only repel mountain pine beetles; they also do not support the survival of the beetle’s offspring. This makes the Great Basin bristlecone pine distinct, as nearly all other pine species within mountain pine beetle’s native range in western North America have been shown to be susceptible hosts.

Evidence for a prepupal diapause in the mountain pine beetle (Dendroctonus ponderosae, Coleoptera: Curculionidae, Scolytinae)

Publications Posted on: June 01, 2018
Dormancy strategies, including diapause and quiescence, enable insects to evade adverse conditions and ensure seasonally appropriate life stages. A mechanistic understanding of a species’ dormancy is necessary to predict population response in a changing climate.

Drought, tree mortality, and wildfire in forests adapted to frequent fire

Publications Posted on: January 23, 2018
Massive tree mortality has occurred rapidly in frequent-fire-adapted forests of the Sierra Nevada, California. This mortality is a product of acute drought compounded by the long-established removal of a key ecosystem process: frequent, low- to moderate-intensity fire. The recent tree mortality has many implications for the future of these forests and the ecological goods and services they provide to society.

Prediction of forest canopy and surface fuels from lidar and satellite time series data in a bark beetle-affected forest

Publications Posted on: October 04, 2017
Wildfire behavior depends on the type, quantity, and condition of fuels, and the effect that bark beetle outbreaks have on fuels is a topic of current research and debate. Remote sensing can provide estimates of fuels across landscapes, although few studies have estimated surface fuels from remote sensing data.

Forest fuels and predicted fire behavior in the first 5 years after a bark beetle outbreak with and without timber harvest (Project INT-EM-F-11-04) [Chapter 12]

Publications Posted on: January 12, 2017
Unprecedented levels of tree mortality from native bark beetle species have occurred in a variety of forest types in Western United States and Canada in recent decades in response to beetle-favorable forest and climatic conditions (Bentz 2009, Meddens and others 2012).

Spectral evidence of early-stage spruce beetle infestation in Engelmann spruce

Publications Posted on: January 10, 2017
Spruce beetle (Dendroctonus rufipennis (Kirby)) outbreaks cause widespread mortality of Engelmann spruce (Picea engelmannii (Parry ex Engelm)) within the subalpine forests of the western United States. Early detection of infestations could allow forest managers to mitigate outbreaks or anticipate a response to tree mortality and the potential effects on ecosystem services of interest.

Bark beetle-induced tree mortality alters stand energy budgets due to water budget changes

Publications Posted on: December 30, 2016
Insect outbreaks are major disturbances that affect a land area similar to that of forest fires across North America. The recent mountain pine bark beetle (Dendroctonus ponderosae) outbreak and its associated blue stain fungi (Grosmannia clavigera) are impacting water partitioning processes of forests in the Rocky Mountain region as the spatially heterogeneous disturbance spreads across the landscape.

Volatile and within-needle terpene changes to Douglas-fir trees associated with Douglas-fir beetle (Coleoptera: Curculionidae) attack

Publications Posted on: September 28, 2016
Mass attack by tree-killing bark beetles (Curculionidae: Scolytinae) brings about large chemical changes in host trees that can have important ecological consequences. For example, mountain pine beetle (Dendroctonus ponderosae Hopkins) attack increases emission of terpenes by lodgepole pine (Pinus contorta Dougl. ex Loud.), affecting foliage flammability with consequences for wildfires.

Elevational shifts in thermal suitability for mountain pine beetle in a changing climate

Science Spotlights Posted on: August 18, 2016
Future forests are being shaped by a changing climate. In addition to the direct effects on trees, climate change is influencing bark beetle disturbance events. Understanding the influence of future climate on bark beetle population growth and associated tree mortality is imperative for management of future forests.

New forest health monitoring methods tested and found effective

Science Spotlights Posted on: August 18, 2016
Disturbance processes such as insect outbreaks are natural disturbance agents in forests. The frequency and intensity of disturbances is expected to increase as the climate changes. Tools are needed to assist managers in determining how disturbances affect the sustainability of forests. RMRS scientists, in collaboration with the index developers, tested this new quantitative forest structural sustainability index on lodgepole pine forests in northern Colorado that had been heavily impacted by mountain pine beetles.