Scientists & Staff

Research Entomologist

Jose Negron

Research Entomologist
240 West Prospect
Fort Collins, CO, 80525
Phone: 970-498-1252

Contact Jose Negron

Current Research

Jose's current research includes reconstructing historical mountain pine beetle outbreaks in the Colorado Front Range. He is also developing field-based developmental models for mountain pine beetle and the Douglas-fir beetle. These will be used to develop predictive models and examining changes in population dynamics under climate change scenarios. Other studies include biological aspects of mountain pine beetle in Colorado, which has been very little studied, such as the role of parent adults in population biology, flight under different stand conditions, phloem consumption, and quantification of brood production from trees growing under different densities. His studies also address the ecology of endemic populations.

Research Interests

Future direction of Jose's work is the biology, ecology, and management of western bark beetles under climate change, how past disturbances shape our forests, and how to incorporate research findings into forest management strategies.

Past Research

There is abundant literature on many aspects of the biology and ecology of the major bark beetles, such as mountain pine beetle and Douglas-fir beetle in the Intermountain West. Very little known about these insects in the Colorado Front Range. Past research has focused on the development of simple models to estimate the probability of infestation and extent of mortality caused by bark beetles. Target species include mountain pine beetle, Douglas-fir beetle, pinyon ips beetles, and the roundheaded pine beetle in Colorado, New Mexico, Arizona, and the Black Hills. Other work addressed little know aspects on the biology of the western balsam bark beetle, and the flight periodicity and sampling of populations of Douglas-fir beetle. Fire and insect interactions are also part of Jose's research portfolio.

Why This Research is Important

Bark beetles are integral components of the ecology of western forests. Insect-caused mortality often comes in conflict with land manager objectives and impact other ecosystem services. Bark beetles, particularly the mountain pine beetle, have been the subject of research for decades. Still large gaps exist in our knowledge on how these insects operate and shape our forests and how to use the information in forest management. Climate change is challenging knowledge from the past as insects are responding to climate change by expanding distributions, exhibiting different overwintering ecology, and influencing developmental patterns to name a few. In order to better manage disturbances as climate change continues to manifest, our knowledge has to be updated to offer proper management responses.


  • University of Puerto Rico, B.S. Biology, 1982
  • Louisiana State University, Baton Rouge, M.S. Entomology, 1985
  • Louisiana State University, Baton Rouge, Ph.D. Entomology, 1988

Professional Experience

  • Research Entomologist, USDA Forest Service, Rocky Mountain Research Station 1993 - Current
  • Entomologist, USDA Forest Service, Forest Health Protection 1988 - 1993
  • Professor in Entomology, University of Puerto Rico 1990 - 1991
  • Graduate student and research assistant, Louisiana State University 1983 - 1988

Featured Publications & Products

Publications & Products

National Research Highlights

Pine bark (center) and other beetles found in a dead Ponderosa pine in the U.S. Department of Agriculture (USDA) Forest Service (FS) Sequoia National Forest are displayed on the inner side of a piece of outer bark that Entomologist Beverly Bulaon removed in search for pine bark beetles burrowed in dead conifers, near Posey, CA, on August 24, 2016.

New forest health monitoring methods tested and found effective

Year: 2017

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. To help with this, a structural sustainability index was developed to allow comparisons across forested landscapes.

Bole charring caused by a wildfire in a ponderosa pine forest. The extent of bole scorch is related to the probability of infestation by pine engraver beetles. U.S. Department of Agriculture Forest Service.

Insects Associated with Fire-injured Ponderosa Pine

Year: 2016

Forest Service scientists examined various aspects of the interaction between fire injury and subsequent insect infestations. Different types of fire injury and tree characteristics, such as the extent of bark damage, crown injury, and tree size, were correlated to infestations by different bark beetles and wood-boring insects. Some of the insects occurred jointly and were associated with both live or dead trees.

Biocontrol method uses mites to manage mountain pine beetles. USDA Forest Service

Synthesis Paper on the Mountain Pine Beetle Biology and Management Now Available

Year: 2014

A series of 10 papers prepared by experts on mountain pine present a synthesis of the state of the knowledge on selected aspects on the beetle biology, ecology, and management of the insect. The synthesis involved mountain pine beetle literature dating back to the late 1890s. It was prepared primarily by the Forest Service Research and Development entomologists members of the Western Bark Beetle Group. The papers were published in the June 2014 edition of Forest Science.

Last modified: Monday, December 11, 2017