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Keyword: forest insects

Complementing insect aerial surveys with satellite imagery

Science Spotlights Posted on: September 06, 2019
Forest insects kill large numbers of trees in the western United States each year. The US Forest Service monitors and quantifies tree mortality from insect outbreaks using annual aerial detection surveys. The Rocky Mountain Research Station (RMRS) is demonstrating how satellite imagery can be used to produce annual maps of tree mortality, as the Forest Service anticipates relying more on satellite imagery, a cheaper alternative to aerial detection surveys, to monitor forest health in the future.

Can spruce beetle (Dendroctonus rufipennis Kirky) pheromone trap catches or stand conditions predict Engelmann spruce (Picea engelmannii Parry ex Engelm.) tree mortality in Colorado?

Publications Posted on: July 19, 2017
1) Bark beetles (Coleoptera: Curculionidae: Scolytinae) can cause extensive tree mortality in forests dominated by their hosts. Among these, the spruce beetle (Dendroctonus rufipennis) is one of the most important beetles in western North America causing Engelmann spruce (Picea engelmannii) tree mortality.

Endemic forest disturbances and stand structure of ponderosa pine (Pinus ponderosa) in the Upper Pine Creek Research Natural Area, South Dakota, USA

Publications Posted on: January 10, 2017
Disturbances are natural and essential components of healthy ecosystems, but their ecological roles in the maintenance of endemic conditions for an area (that is, long-established levels of activity that are of low magnitude and relatively static intensity and cause unnoticed or relatively low amounts of tree killing, defoliation, or deformation) are poorly understood.

Forest insect and fungal pathogen responses to drought [Chapter 6]

Publications Posted on: August 18, 2016
Recent changes in precipitation patterns and in the occurrence of extreme temperature and precipitation events have been documented in many forested regions of the United States (Ryan and Vose 2012). Changes in drought intensity and frequency have the potential to alter populations and impacts of tree-damaging forest insects and pathogens (Ayers and Lombardero 2000, Dale and others 2001, Weed and others 2013).

Observed and anticipated impacts of drought on forest insects and diseases in the United States

Publications Posted on: July 15, 2016
Future anthropogenic-induced changes to the earth’s climate will likely include increases in temperature and changes in precipitation that will increase the frequency and severity of droughts. Insects and fungal diseases are important disturbances in forests, yet understanding of the role of drought in outbreaks of these agents is limited. Current knowledge concerning the effects of drought on herbivorous insect and pathogen outbreaks in U.S.

Douglas-fir tussock moth- and Douglas-fir beetle-caused mortality in a ponderosa pine/Douglas-fir forest in the Colorado Front Range, USA

Publications Posted on: March 26, 2015
An outbreak of the Douglas-fir tussock moth, Orgyia pseudotsugata McDunnough, occurred in the South Platte River drainage on the Pike-San Isabel National Forest in the Colorado Front Range attacking Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco. Stocking levels, species composition, and tree size in heavily and lightly defoliated stands were similar.

Field guide to diseases & insects of the Rocky Mountain Region

Publications Posted on: January 31, 2011
This field guide is a forest management tool for field identification of biotic and abiotic agents that damage native trees in Colorado, Kansas, Nebraska, South Dakota, and Wyoming, which constitute the USDA Forest Service's Rocky Mountain Region. The guide focuses only on tree diseases and forest insects that have significant economic, ecological, and/ or aesthetic impacts; this guide does not necessarily cover all possible damage agents.