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Keyword: bark beetles

Within-stand distribution of tree mortality caused by mountain pine beetle, Dendroctonus ponderosae Hopkins

Publications Posted on: October 02, 2020
The mountain pine beetle (MPB) (Dendroctonus ponderosae) is a bark beetle that attacks and kills ponderosa pine (Pinus ponderosa), among other pine species throughout the western conifer forests of the United States and Canada, particularly in dense stands comprising large trees. There is information on the stand conditions that the insect prefers.

Physical and chemical characteristics of blue and Engelmann spruce relative to spruce beetle host selection and colonization

Publications Posted on: September 17, 2020
Bark beetles are keystone species that can alter the structure and function of forested ecosystems, yet the mechanisms underlying host selection and successful colonization remain poorly understood for most species. Comparison of closely related tree species that vary in their susceptibility to bark beetles could provide insights into such mechanisms.

Reconstructing mountain pine beetle outbreaks in the Colorado Front Range

Science Spotlights Posted on: September 02, 2020
From the late 1990s through the mid-2010s there have been extensive outbreaks of mountain pine beetle across the west from the Southern Rockies to British Columbia. It is often thought that these outbreaks are “unprecedented.” An understanding of historical disturbances is particularly critical as we continue to develop strategies for forest management under climate change.

Tree-ring reconstruction of bark beetle regimes in Kazakhstan spruce forests

Science Spotlights Posted on: September 02, 2020
Less than 5% of Kazakhstan is forested, so those forests are highly valued for erosion prevention, water retention, timber, and recreation. Yet little is known about their ecology or threats to forest health. A 200-year tree-ring reconstruction by RMRS scientists and collaborators indicates that bark beetles have historically posed little threat to these forests.

Tree-ring reconstruction of bark beetle disturbances in the Picea schrenkiana Fisch. et Mey. Forests of Southeast Kazakhstan

Publications Posted on: August 16, 2020
Ips hauseri Reitter is themost important bark beetle on Picea schrenkiana in southeastKazakhstan, but its biology, ecology, and outbreak dynamics are poorly known. We dendrochronologically reconstructed a 200-year history of disturbances in the Kazakh Tien Shan P. schrenkiana forests.

Impacts of mountain pine beetle outbreaks on lodgepole pine forests in the Intermountain West, U.S., 2004–2019

Publications Posted on: July 31, 2020
Mountain pine beetle, Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae), is the most important forest insect in western North America. We determined causes and rates of tree mortality and changes in forest structure and composition associated with D. ponderosae outbreaks in the Intermountain West, U.S.

Reconstructing historical outbreaks of mountain pine beetle in lodgepole pine forests in the Colorado Front Range

Publications Posted on: July 27, 2020
Regional-scale mountain pine beetle (Dendroctonus ponderosae) outbreaks in the first decade of the 2000s affected millions of hectares of lodgepole pine (Pinus contorta) in western North American forests. In Colorado, 1.4 million ha exhibited high mortality. These events prompted questions about whether historical outbreaks reached the scale of this most recent event.

Are wildfires following bark beetles more severe?

Publications Posted on: June 17, 2020
Bark beetles are responsible for large numbers of dead trees in ponderosa pine forests in the United States. The relationship between tree mortality caused by bark beetles and increasingly severe wildfires has been analysed by Carolyn Sieg and colleagues using a detailed physics-based fire behaviour model.

Mapping multiple insect outbreaks across large regions annually using Landsat time series data

Publications Posted on: June 17, 2020
Forest insect outbreaks have caused and will continue to cause extensive tree mortality worldwide, affecting ecosystem services provided by forests. Remote sensing is an effective tool for detecting and mapping tree mortality caused by forest insect outbreaks. In this study, we map insect-caused tree mortality across three coniferous forests in the Western United States for the years 1984 to 2018.

Using satellite imagery to evaluate bark beetle-caused tree mortality reported in aerial surveys in a mixed conifer forest in northern Idaho, USA

Publications Posted on: May 15, 2020
Bark beetles cause significant tree mortality in western North America. The United States Forest Service coordinates annual insect and disease surveys (IDS) by observers in airplanes to map and quantify the tree mortality caused by beetles. The subjective nature of these surveys means that accuracy evaluation is important for characterizing uncertainty.