Larry Gut

Larry Gut

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Department of Entomology

PhD - Oregon State University (1985)
MS - Oregon State University (1980)
BS - California State University, Chico (1976)


I have 40 years of research and outreach/extension experience in pome and stone fruit cropping systems. Since arriving in Michigan in 1997, my program has contributed to a foundation that has allowed the tree fruit industries in the state, as well as nationally and internationally, to respond to changes in the availability and efficacy of insecticides in a proactive manner. A substantial portion of my research program focuses on reducing reliance on the broad-spectrum insecticides. Our team has focused special attention on a method of control that is commonly referred to as mating disruption in an effort to increase its adoption. A majority of Michigan’s apple, cherry and peach growers now rely on mating disruption and other reduced-risk controls for managing arthropod pests. Worldwide reliance on mating disruption for managing codling moth has expanded by 100% in the past 15 years, with nearly 600,000 acres currently treated with this environmentally sound control. We have actively researched chemical attractants for several insect species in an effort to develop monitoring systems or new controls. The ability to accurately measure and predict pest activity is fundamental to the successful implementation of IPM. Most recently, my program has expanded into a new area of research, sterile insect release (SIR) as a pest management strategy.

Current assignment: Teaching 10% | Research 25% | Extension 65%

Program Description


I do not hold a credit-based instructional assignment; thus, my teaching effort focuses on graduate student education, but includes involvement in IPM workshops, guest lecturing, mentoring post-doctoral research associates and advising undergraduate students. Graduate and undergraduate students in the tree fruit entomology program get an education, a paycheck and have a lot of fun. I currently advise 1 MS and 2 PhD students, as well as 3 post-doctoral research associates. During my career, I have advised 8 MS and 5 PhD students to completion of their degree.


As Michigan’s Extension Specialist in Tree Fruit Entomology, I am responsible for developing the technology and knowledge base to support the promotion and adoption of Integrated Pest Management (IPM) in apple, cherry, peach, pear and plum. The overall aim of my program is to conduct fundamental and applied research that leads to the development of ecologically and economically sound pest management programs. Consistent funding from USDA grant programs, MSU Project GREEEN, commodity groups and private industry have allowed me to establish a robust short-and long-term applied research program, while also building a solid basic research program centered on the use of pheromones and other behavior-modifying chemicals for insect monitoring and control. Research conducted with his colleague, Dr. Miller, has contributed to a greater understanding of the mechanisms by which mating disruption is achieved. Dr. Gut is involved in nationally coordinated efforts to develop management programs for spotted wing drosophila and brown marmorated stink bug, two invasive pests that have greatly impacted IPM programs in US fruit crops.  Current projects also include a team effort related to pollinator health in fruit crops and an international program to expand the use of the sterile insect technique for managing codling moth. The majority of his research on chemical control of fruit pests is working with selective insecticide chemistries to determine how they might fit into apple, cherry or peach IPM programs.


The aim of Dr. Gut’s extension program is to educate growers, scouts, consultants and others involved in the tree fruit industries in IPM practices, including pest and natural enemy ecology, scouting, decision-making, selecting appropriate control tactics and resistance management. He employs a team approach, working with Extension colleagues across a number of disciplines to deliver information to the fruit industries. Findings and recommendations are published in a timely manner in the MSU Pest Management Guide (E-154), MSUE News articles, and MSU IPM and Fruit websites, and presented to grower and industry groups at the major Michigan and National grower meetings.


  • Chemical ecology
  • Pheromone-based mating disruption
  • Ecology and management of invasive pests
  • Integrated crop pollination
  • Development of monitoring tools and programs
  • Sterile insect release
  • Efficacy of reduced-risk insecticides

Professional Experience

  • 2005-Present - Professor, Dept. of Entomology, Michigan State University
  • 2001-2005 - Associate Professor, Dept. of Entomology, Michigan State University
  • 1997-2001 - Assistant Professor, Dept of Entomology, Michigan State University
  • 1992-1997 - Instructor, Department of Horticulture, Wenatchee Valley College
  • 1990-1997 - Research Coordinator, Department of Entomology, Washington State University
  • 1988-1990 - Research Associate, Department of Horticulture, University of Illinois
  • 1986-1988 - Research Associate, Department of Entomology, Washington State University

Selected Publications

  • Kirkpatrick, D.M., P.S. McGhee, L.J. Gut and J.R. Miller. 2017. Improving monitoring tools for spotted wing drosophila, Drosophila suzukii. Entomol. Exp. et Appl. 156:87-92.

  • Huang, J., L.J. Gut., and M. Grieshop. 2017. Evaluation of food-based attractants for spotted wing drosophila, Drosophila suzukii (Diptera: Drosophilidae). Environ. Entomol. 46:878-884.


  • Adams, C. G., P. S. McGhee, J. H. Schenker, L. J. Gut, J. Brunner, and J. R. Miller. 2017. Line-trapping. of Codling Moth, Cydia pomonella, (Lepidoptera: Tortricidae): a novel approach to improving the precision of capture numbers in traps monitoring pest density. J. Econ. Entomol. 110:1508-1511.


  • Gibbs, J. J.K. Neelendra, J. K. Wilson, N.L. Rothwell, K. Powers, M. Haas, L. Gut, D.J Biddinger and R. Isaacs. 2017. Does passive sampling accurately reflect the bee (Apoidea: Anthophila) communities pollinating apple and sour cherry orchards? Environ. Entomol. 46:579-588.

  • Adams, C. G., J. H. Schenker, P. S. McGhee, L. J. Gut, J. Brunner, and J. R. Miller. 2017. Maximizing information yield from pheromone-baited monitoring traps: Estimating plume reach, trapping radius, and absolute density of Codling Moth (Cydia pomonella) in Michigan apple. J. Econ. Entomol. 110:305-318.

  • McGhee, P.S., J.R. Miller, D.R. Thomson and L.J. Gut. 2016. Optimizing aerosol emitters for mating disruption of codling moth, Cydia pomonella L. J. Chem. Ecol. 42:612-616.

  • Kirkpatrick, D.M., P.S. McGhee, S.L. Hermann, L.J. Gut and J.R. Miller. 2016. Alightment of spotted wing drosophila, Drosophila suzukii (Diptera: Drosophilidae) on odorless disks varying in color. Environ. Entomol. 45:185-191.

  • Miller, J.R. and L.J. Gut. 2015. Mating disruption for the 21st century: Matching technology with mechanism. Environ. Entomol. 44:427-453.

  • Huang, J., L.J. Gut., and M. Grieshop. 2015. Development of a new attract-and-kill technology for Oriental fruit moth control using insecticide-impregnated fabric. Entomologia Experimentalis et Applicata 154:102-109.

  • McGhee, P.S., L.J. Gut and J.R. Miller. 2014. Aerosol emitters disrupt codling moth, Cydia pomonella, competitively. Pest Manag. Sci. 70:1859-1862.

  • Smith, J.J., T.H.Q. Powell, L. Teixeira, W.O. Armstrong, R.J. McClowry, R. Isaacs, G.R. Hood, J.L. Feder and L.J. Gut. 2014. Genetic structure of cherry fruit fly (Rhagoletis cingulata) populations across managed, unmanaged, and natural habitats. Entomologia Experimentalis et Applicata 150:157-165.

  • Reinke, M.D., P. Y. Siegert, P.S. McGhee, L.J. Gut and J.R. Miller. 2014. Pheromone release rate determines whether sexual communication of Oriental fruit moth is disrupted by competitive or non-competitive mechanisms. Entomol. Entomologia Experimentalis et Applica 150:1-6.

  • Huang, J., L.J. Gut and J.M. Miller. 2013. Separating the attractant from the toxicant improves attract and- kill of codling moth (Lepidoptera: Tortricidae). J. Econ. Entomol. 106:2144-2150.

  • Lee J.C, P.W. Shearer, L.D. Barrantes, E.H. Beers, H.J. Burrack, D.T. Dalton, A.J. Dreves, L. J. Gut, et al. 2013. Trap designs for monitoring Drosophila suzukii (Diptera: Drosophilidae). Environ. Entomol. 42:1348-1355.

  • Huang, J., L.J. Gut and J.M. Miller. 2013. Codling moth, Cydia pomonella, captures in monitoring traps as influenced by proximity to competing female-like vs. high-releasing pheromone point sources. J. Insect Behav. 26:660-666.

  • Stelinski, L.L., L.J. Gut and J. Miller. 2013. An attempt to increase efficacy of moth mating disruption by co-releasing pheromones with kairomones and to understand possible underlying mechanisms.

Selected Extension Publications

  • Wilson, J. L. Gut, N. Rothwell, M. Haas, E. Pochubay, K. Powers, M. Whalon and J. Wise. (revised June 2017). Managing Spotted Wing Drosophila in Michigan Cherry. Fact Sheet.

  • Wilson, J., L.J., Gut, M. Haas, M. Grieshop, K. Poley and W. Shane. (revised July 2017). Managing Brown Marmorated Stink Bug in Michigan Orchards. Fact Sheet.

  • Wise, J., L.J., Gut, R. Isaacs, A. M. C. Schilder, B. Zandstra, E. Hanson & B. Shane. 2017. Michigan Fruit Management Guide. Michigan State University Extension Bulletin E-154.

  • Jones, D. and L. Gut. 2017. Susceptibility of commercial Michigan plum cultivars to spotted wing Drosophila. MSU Extension News for Agric. Sept 27.

  • Jones, D. and L. Gut. 2017. Do growers have to manage for spotted wing Drosophila in processing peaches? MSU Extension News for Agric. Sept 27.

  • Wilson, J. L. Gut and A. Irish-Brown. 2017. Look-a-like late season apple damage by bitter pit, brown marmorated stink bugs or apple maggot. MSU Extension News for Agric. Sept 6.

  • Jones, D. and Gut, L. 2017. Management considerations for peach orchards with edge damage from oriental fruit moth. MSU Extension News for Agric. June 27.

  • Gut, L. and M. Haas. 2017. Black stem borer management in spring. MSU Extension News for Agric. May 9.

  • Gut, L. and M. Haas. 2017. Managing Oriental fruit moth using mating disruption. MSU Extension News for Agric. April 4.

  • Gut, L., J. Huang, P and P. McGhee. 2015. A Novel Mating Disruption System Designed for Rapid Deployment of Reservoir Pheromone Dispensers. New York Fruit Quarterly 23 (3): 10-13.

  • Grieshop, M., L. Gut, J. Wise, P. Owen-Smith, G. Sundin, S. Miller, J. Flore, G. Lang and R. Perry. 2015. Development of solid set delivery systems for high-density apples. New York Fruit Quarterly 23 (2): 16-20.

  • Epstein, D., L. Gut and G. Sundin. 2014. A Pocket Guide for IPM Scouting in Michigan Apples, 4th Edition. Michigan State University Extension Bulletin E-2720, 74 pp.