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Jose Negron

Research Entomologist

Research Entomologist

240 West Prospect
Fort Collins, CO 80525
Contact Jose Negron

Current Research

My current research studies include developing field-based developmental models for various bark beetles to develop predictive models and use these for examining changes in population dynamics under a climate change scenarios. I am also conducting studies on the interactions between bark beetle-caused mortality and subsequent fire occurrence, down woody debris accumulations, impacts on foliar moisture, and fire behavior modeling. Other studies include biological aspects of mountain pine beetle in Colorado, which has been very little studied, such as the role of of parent adults in population biology, flight under different stand conditions, phloem consumption, quantification of brood production from trees growing under different densities. I am also examining questions on host transition by mountain pine beetle and the genetic structure of beetles emerging from different hosts and outbreak locations.

Research Interests

Future direction of my work is the biology, ecology, and management of western bark beetles under climate change. Continuing basic biology field studies, the examination of questions relating host transitions and the genetic structure of populations.

Past Research

Although there is abundant literature on many aspects of the biology and ecology of the major bark beetles, such as mountain pine beetle in lodgepole pine forests, little is known about other important species in other forest types. These insects play significant roles on the ecology of western forest ecosystems and interact with other agents, such as fire, blowdown events, and defoliation. How these insects will behave under a climate change scenario is not well understood and is likely to raise the need to re-examine biological parameters and interactions with forest conditions and stand susceptibility. Although these organisms 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. The need to better understand the ecology of these insects and how managers may need to respond, in particular on a climate change scenario, is needed.

Why This Research is Important

The main reasons that make this research relevant include; first, advancing the understanding and science about bark beetles, which as part of natural ecosystems, are major factors in regulating forest composition and structure, primary productivity, and interactions with other disturbance agents such as fire, defoliation, pathogens, and blowdown events; second, providing tools for forest managers for addressing insect-caused mortality in high-value scenarios such as campgrounds, recreation areas, and ski areas; third, the ecology of these organisms will be strongly influenced by climate change and understanding these processes will allow developing mitigation and adaptation strategies where appropriate.


  • 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 to present

    Entomologist, USDA Forest Service, Forest Health Protection
    1988 to 1993

    Graduate student and research assistant, Louisiana State University
    1983 to 1988

    Featured Publications


    West, Daniel R.; Briggs, Jennifer S.; Jacobi, William R.; Negron, Jose, 2016. Mountain pine beetle host selection between lodgepole and ponderosa pines in the southern Rocky Mountains
    Zhou, Haifeng; Zhu, Junyong; Gleisner, Roland; Qiu, Xueqing; Horn, Eric; Negron, Jose, 2016. Pilot-scale demonstration of SPORL for bioconversion of lodgepole pine to bioethanol and lignosulfonate
    Negron, Jose; McMillin, Joel; Sieg, Carolyn H.; Fowler, James F.; Allen, Kurt K.; Wadleigh, Linda L.; Anhold, John A.; Gibson, Ken E., 2016. Variables associated with the occurrence of Ips beetles, red turpentine beetle and wood borers in live and dead ponderosa pines with post-fire injury
    Fettig, Christopher J.; Gibson, Kenneth E.; Munson, A. Steven; Negron, Jose, 2014. A comment on “Management for mountain pine beetle outbreak suppression: Does relevant science support current policy?"
    Fettig, Christopher J.; Gibson, Kenneth E.; Munson, A. Steven; Negron, Jose, 2014. Cultural practices for prevention and control of mountain pine beetle infestations
    Frank, John M.; Massman Jr, William J.; Ewers, Brent E.; Huckaby, Laurie Kay Stroh; Negron, Jose, 2014. Ecosystem CO2/H2O fluxes are explained by hydraulically limited gas exchange during tree mortality from spruce bark beetles
    Hoeger, Ingrid; Gleisner, Rolland; Negron, Jose; Rojas, Orlando J.; Zhu, J. Y., 2014. Mountain pine beetle-killed lodgepole pine for the production of submicron lignocellulose fibrils
    Mercado, Javier E.; Hofstetter, Richard W.; Reboletti, Danielle M.; Negron, Jose, 2014. Phoretic symbionts of the mountain pine beetle (Dendroctonus ponderosae Hopkins)
    Gillette, Nancy E.; Wood, David L.; Hines, Sarah J.; Runyon, Justin B.; Negron, Jose, 2014. The once and future forest: Consequences of mountain pine beetle treatment decisions
    Zhou, Haifeng; Zhu, J.Y.; Luo, Xiaolin; Leu, Shao-Yuan; Wu, Xiaolei; Gleisner, Roland; Dien, Bruce S.; Hector, Ronald E.; Yang, Dongjie; Qiu, Xueqing; Horn, Eric; Negron, Jose, 2013. Bioconversion of Beetle-Killed Lodgepole Pine Using SPORL: Process Scale-up Design, Lignin Coproduct, and High Solids Fermentation without detoxification
    Hubbard, Robert M.; Rhoades, Charles (Chuck) C.; Elder, Kelly J.; Negron, Jose, 2013. Changes in transpiration and foliage growth in lodgepole pine trees following mountain pine beetle attack and mechanical girdling
    Moore, David J. P.; Trahan, Nicole A.; Wilkes, Phil; Quaife, Tristan; Stephens, Britton B.; Elder, Kelly J.; Desai, Ankur R.; Negron, Jose; Monson, Russell K., 2013. Persistent reduced ecosystem respiration after insect disturbance in high elevation forests
    Bright, Benjamin C.; Hudak, Andrew T.; McGaughey, Robert; Andersen, Hans-Erik; Negron, Jose, 2013. Predicting live and dead tree basal area of bark beetle affected forests from discrete-return lidar
    Withrow, John R.; Lundquist, John E.; Negron, Jose, 2013. Spatial dispersal of Douglas-fir beetle populations in Colorado and Wyoming
    Schoennagel, Tania; Veblen, Thomas T.; Negron, Jose; Smith, Jeremy M., 2012. Effects of mountain pine beetle on fuels and expected fire behavior in lodgepole pine forests, Colorado, USA
    Hudak, Andrew T.; Bright, Ben; Negron, Jose; McGaughey, Robert; Andersen, Hans-Erik; Hicke, Jeffrey A., 2012. Predicting live and dead basal area in bark beetle-affected forests from discrete-return LiDAR
    Jolly, William M.; Parsons, Russell A.; Hadlow, Ann M.; Cohn, Gregory M.; McAllister, Sara S.; Popp, John B.; Hubbard, Robert M.; Negron, Jose, 2012. Relationships between moisture, chemistry, and ignition of Pinus contorta needles during the early stages of mountain pine beetle attack
    Lee, Jana C.; Negron, Jose; McElwey, Sally J.; Williams, Livy; Witcosky, Jeffrey J.; Popp, John B.; Seybold, Steven J., 2011. Biology of the invasive banded elm bark beetle (Coleoptera: Scolytidae) in the western United States
    Zhu, Junyong; Luo, Xiaolin; Tian, Shen; Gleisner, Roland; Negron, Jose; Horn, Eric, 2011. Efficient ethanol production from beetle-killed lodgepole pine using SPORL technology and Saccharomyces cerevisiae without detoxification
    Negron, Jose, 2011. III. Insects
    Costello, Sheryl L.; Negron, Jose; Jacobi, William R., 2011. Wood-boring insect abundance in fire-injured ponderosa pine
    Bentz, Barbara J.; Regniere, Jacques; Fettig, Christopher J.; Hansen, Matt; Hayes, Jane L.; Hicke, Jeffrey A.; Kelsey, Rick G.; Negron, Jose; Seybold, Steven J., 2010. Climate change and bark beetles of the western United States and Canada: Direct and indirect effects
    Fowler, James F.; Sieg, Carolyn H.; McMillin, Joel; Allen, Kurt K.; Negron, Jose; Wadleigh, Linda L.; Anhold, John A.; Gibson, Ken E., 2010. Development of post-fire crown damage mortality thresholds in ponderosa pine
    Bentz, Barbara J.; Logan, Jesse; MacMahon, Jim; Allen, Craig D.; Ayres, Matt; Berg, Ed; Carroll, Allan; Hansen, Matt; Hicke, Jeff; Joyce, Linda A.; Macfarlane, Wallace; Munson, Steve; Negron, Jose; Paine, Tim; Powell, Jim; Raffa, Ken; Regniere, Jacques; Reid, Mary; Romme, Bill; Seybold, Steven J.; Six, Diana; Tomback, Diana; Vandygriff, James C.; Veblen, Tom; White, Mike; Witcosky, Jeff; Wood, David, 2009. Bark beetle outbreaks in western North America: Causes and consequences
    Negron, Jose; McMillin, Joel D.; Anhold, John A.; Coulson, Dave, 2009. Bark beetle-caused mortality in a drought-affected ponderosa pine landscape in Arizona, USA
    Lee, Janna C.; Aguayo, Ingrid; Aslin, Ray; Durham, Gail; Hamud, Shakeeb M.; Moltzan, Beruce D.; Munson, A. Steve; Negron, Jose; Peterson, Travis; Ragenovich, Iral R.; Witcosky, Jeffrey J.; Seybold, Steven J., 2009. Co-occurrence of the invasive banded and European elm bark beetles (Coleoptera: Scolytidae) in North America
    Gibson, Ken; Negron, Jose, 2009. Fire and bark beetle interactions
    Zolubas, Paulius; Negron, Jose; Munson, A. Steven, 2009. Modelling spruce bark beetle infestation probability
    Allen-Reid, D.; Anhold, J.; Cluck, D.; Eager, T.; Mask, R.; McMillin, J.; Munson, S.; Negron, Jose; Rogers, T.; Ryerson, D.; Smith, E.; Smith, S.; Steed, B.; Thier, R., 2008. Pinon pine mortality event in the Southwest: An update for 2005
    Kaufmann, Merrill R.; Aplet, Gregory H.; Babler, Michael G.; Baker, William L.; Bentz, Barbara J.; Harrington, Michael; Hawkes, Brad C.; Huckaby, Laurie Kay Stroh; Jenkins, Michael J.; Kashian, Daniel M.; Keane II, Robert E.; Kulakowski, Dominik; McCaughey, Ward; McHugh, Charles W.; Negron, Jose; Popp, John B.; Romme, William H.; Shepperd, Wayne; Smith, Frederick W.; Sutherland, Elaine K.; Tinker, Daniel; Veblen, Thomas T., 2008. The status of our scientific understanding of lodgepole pine and mountain pine beetles - a focus on forest ecology and fire behavior
    Negron, Jose; Bentz, Barbara J.; Fettig, Christopher J.; Gillette, Nancy; Hansen, Matt; Hayes, Jane L.; Kelsey, Rick G.; Lundquist, John E.; Lynch, Ann M.; Progar, Robert A.; Seybold, Steven J., 2008. US Forest Service bark beetle research in the western United States: Looking toward the future
    Fettig, Christopher J.; Klepzig, Kier D.; Billings, Ronald f.; Munson, A. Steven; Nebeker, T. Evan; Negron, Jose; Nowak, John T., 2007. The effectiveness of vegetation management practices for prevention and control of bark beetle infestations in coniferous forests of the western and southern United States
    Sieg, Carolyn H.; McMillin, Joel D.; Fowler, James F.; Allen, Kurt K.; Negron, Jose; Wadleigh, Linda L.; Anhold, John A.; Gibson, Ken E., 2006. Best predictors for postfire mortality of ponderosa pine trees in the Intermountain West
    Negron, Jose; Witcosky, Jeffrey J.; Cain, Robert J.; LaBonte, James R.; Duerr, Donald A. II; McElwey, Sally J.; Lee, Jana C.; Seybold, Steven J., 2005. The banded elm bark beetle: A new threat to elms in North America
    Schoettle, Anna W.; Negron, Jose, 2001. First report of two cone and seed insects on Pinus flexilis
    Negron, Jose; Shepperd, Wayne A.; Mata, Steve A.; Popp, John B.; Asherin, Lance A.; Schoettle, Anna W.; Schmid, John M.; Leatherman, David A., 2001. Solar treatments for reducing survival of mountain pine beetle in infested ponderosa and lodgepole pine logs
    Geils, Brian W.; Lundquist, John E.; Negron, Jose; Beatty, Jerome S., 1995. Disturbance regimes and their relationships to forest health.
    Typical attack by wood borers to fire-injured ponderosa pine showing galleries and bark wood residue.
    Rocky Mountain Research Station scientists are looking at tools aimed to respond to insect infestations after a fire occurs, particularly around large-scale conifer forests.
    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.
    Partially cut Engelmann spruce stand.
    Rocky Mountain Research Station scientists, partnered with Forest Service Forest Health Protection, have determined that partial forest cutting can, under typical bark beetle conditions, reduce spruce beetle-caused tree mortality.
    Adult mountain pine beetle in a pitch tube (photo by William M. Ciesla,
    A series of ten papers prepared by experts on mountain pine beetles present a synthesis of the state of knowledge on selected aspects of beetle biology, ecology, and management. The synthesis was prepared primarily by Forest Service Research and Development entomologists who are members of the Western Bark Beetle Group. The papers were published in the June, 2014 edition of Forest Science.
    The development of ecological restoration treatment prescriptions based on historical forest structure is needed to inform management activities within the Collaborative Forest Landscape Restoration (CFLR) and other restoration efforts. Our goal is to provide managers with locally derived, historically realistic, and climatically sustainable targets for desired future stand and landscape conditions for the Colorado Front Range and South Dakota Black Hills. 

    National Strategic Program Areas: 
    Resource Management and Use
    National Priority Research Areas: 
    Climate Change
    RMRS Science Program Areas: 
    Forest and Woodland Ecosystems