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Keyword: Dendroctonus rufipennis

Beetle pheromones and maple volatiles reduce spruce beetle attacks on spruce trees

Science Spotlights Posted on: August 21, 2019
The spruce beetle is the most significant mortality agent of spruce in western North America, and management options are limited. In cooperation with FHP partners, a novel combination of a beetle-produced pheromone (MCH) and compounds from a non-host (maple) tree (AKB) were shown to be repellent to spruce beetles. High-release rate MCH-AKB devices that are attached to live spruce can reduce spruce beetle attacks on individual trees and small groups of trees.

A test of lethal trap trees for control of spruce beetles

Publications Posted on: July 22, 2019
The spruce beetle, Dendroctonus rufipennis, can cause extensive mortality of Engelmann spruce, Picea engelmannii, during outbreaks. Endemic populations breed in the underside of downed spruces. Outbreaks often develop after blowdowns that create abundant downed trees where beetle populations can increase. Occasionally, managers practice suppression to protect high-value resources.

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.