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Keyword: Dendroctonus rufipennis

Evidence of compounded disturbance effects on vegetation recovery following high-severity wildfire and spruce beetle outbreak

Publications Posted on: October 25, 2017
Spruce beetle (Dendroctonus rufipennis) outbreaks are rapidly spreading throughout subalpine forests of the Rocky Mountains, raising concerns that altered fuel structures may increase the ecological severity of wildfires.

3-Methylcyclohex-2-en-1-one for area and individual tree protection against spruce beetle (Coleoptera: Curculionidae: Scolytinae) attack in the southern Rocky Mountains

Publications Posted on: September 25, 2017
We tested 3-methylcyclohex-2-en-1-one (MCH) and an Acer kairomone blend (AKB) as repellent semiochemicals for area and single tree protection to prevent spruce beetle (Dendroctonus rufipennis Kirby) attacks at locations in Utah and New Mexico.

Semiochemical repellents reduce spruce beetle infestations

Science Spotlights Posted on: August 23, 2017
The spruce beetle is the most significant mortality agent of spruce in western North America. Management options are limited but an effective semiochemical repellent could be economically and environmentally advantageous, compared to insecticide applications, for protection single trees and small stands.

Traumatic resin ducts as indicators of bark beetle outbreaks

Publications Posted on: August 22, 2017
The formation of traumatic resin ducts (TRDs) represents an important induced defense in woody plants that enhances oleoresin production and flow in response to environmental perturbations. In some genera (Pinus), resin ducts are copious and conspicuous; however, in others (Picea), resin ducts are relatively rare.

Diapause and overwintering of two spruce bark beetle species

Publications Posted on: July 19, 2017
Diapause, a strategy to endure unfavourable conditions (e.g. cold winters) is commonly found in ectothermic organisms and is characterized by an arrest of development and reproduction, a reduction ofmetabolic rate, and an increased resistance to adversity. Diapause, in addition to adaptations for surviving low winter temperatures, significantly influences phenology, voltinism and ultimately population growth.

Lethal trap trees and semiochemical repellents as area host protection strategies for spruce beetle in Utah

Projects Posted on: August 18, 2016
Spruce beetle (Coleoptera: Curculionidae, Scolytinae) is the major disturbance agent of North American spruce, but current methods to suppress beetle populations vary in scale efficacy, cost, and environmental impact. A high-dose, high release MCH dispenser was found to be an effective area treatment for protection against spruce beetle attacks. Lethal trap trees and semiochemical repellents could provide managers with new tools for protecting hosts trees from spruce beetle attacks.

Lethal trap trees and semiochemical repellents as area host protection strategies for spruce beetle (Coleoptera: Curculionidae, Scolytinae) in Utah

Publications Posted on: August 16, 2016
We tested lethal trap trees and repellent semiochemicals as area treatments to protect host trees from spruce beetle (Dendroctonus rufipennis Kirby) attacks. Lethal trap tree treatments ("spray treatment") combined a spruce beetle bait with carbaryl treatment of the baited spruce.

Reducing spruce beetle-caused mortality in the southern Rocky Mountains

Science Spotlights Posted on: October 09, 2015
Rocky Mountain Research Station scientists, partnered with Forest Service Forest Health Protection, initiated a project in Engelmann spruce (Picea engelmannii) stands on national forests in Arizona, Utah, and Wyoming. This project was initiated to address entomologists' uncertainty about the success of partial cutting as a method to reduce bark beetle-caused tree mortality. Researchers discovered how implementing partial cutting of forests over a geographic area could help mitigate the spruce beetle (Dendroctonus rufipennis) outbreaks, which have been anecdotally linked to the changing climate throughout western North America.

Predicting future spruce beetle infestations

Science Spotlights Posted on: October 05, 2015
In recent decades, bark beetle disturbances are increasing in extent and severity across western forests. Causes and consequences of spruce beetle (Dendroctonus rufipennis) infestation are important to the management of Engelmann spruce (Picea engelmannii) forests. Forest Service scientists modeled the effects of increased temperatures and changing forest stand conditions, such as density and species composition, on the likelihood of spruce beetle infestation over time. Findings from this study are being incorporated into management guidelines for silviculturists who wish to mitigate spruce beetle infestation by modifying the density or composition of Engelmann spruce forests in the Interior West.

Post-fire forest dynamics and climate variability affect spatial and temporal properties of spruce beetle outbreaks on a Sky Island mountain range

Publications Posted on: April 21, 2015
The spruce beetle (Dendroctonus rufipennis) is known for extensive outbreaks resulting in high spruce mortality, but several recent outbreaks in the western United States have been among the largest and most severe in the documentary record. In the Pinaleño Mountains of southeast Arizona, U.S.A., an outbreak in the mid-1990s resulted in 85% mortality of Engelmann spruce >7 cm diameter.