Dr. David W. Onstad

David's picture
Research Scientist,
Corteva Agriscience
Address: Corteva Agriscience, Johnston, IA 50131
Phone: 515-468-8638
Email(s): david.onstad@corteva.com, dwonstad@gmail.com


Appointment: Adjunct Faculty


  1. B.S. in Biological Science, California State University, Sacramento
  2. M.S. in Environmental Systems Engineering, Cornell University
  3. Ph.D. in Entomology, Cornell University (minor in plant pathology)


I work in Iowa at Corteva Agriscience where I create and analyze mathematical models to evaluate resistance management strategies for insect pests and plant pathogens. Before 2012, I was a professor at the University of Illinois where I taught applied ecology and focused on IPM. I have created models of more than 30 species of plants, insects, and diseases, including honey bees, predators, parasitoids, insect pathogens and plant diseases. I have performed research on alfalfa, maize, soybean, broccoli, apple orchards, woodlands, and a few other systems. I am Vice-President of the Plant-Insect Ecosystem Section of the Entomological Society of America and will become President in November 2020. The second edition of my book, Insect Resistance Management: biology, economics and prediction, was published by Academic Press in 2014. The third edition is in preparation. My latest book, The Economics of Integrated Pest Management of Insects, was co-edited with Phil Crain and published by CABI in 2019.

My long-term interests include promotion of entomology in museums, schools, universities, and many other facilities and institutions in society. I also expect to focus on forecasting how entomology and IPM should change to significantly contribute to society and agriculture as the world changes beyond 2040.


Entomology News at Nebraska

Breaking Entomological News...

  • Dr. Susan WellerDr. Susan Weller, director of the University of Nebraska State Museum and professor of Entomology, has been elected a fellow of the Entomological Society of America (ESA). The society noted Weller’s internationally-known research on arctiine moths and other Noctuoidea, and her administrative leadership in promoting entomology and science education. See the article at UNL News for more about Weller's recognition. Congratulations Susan!
  • Marilyn Weidner & GracieWe are pleased to announce that Marilyn Weidner has been named winner of the IANR Exemplary Service Award! Weidner has roles in administrative support, personnel management, data documentation and archiving, review preparation, promotion and evaluation tracking, payroll for 15 departments, and much more. Well deserved Marilyn!
  • Rogan Tokach winning scholarshipCongratulations to Rogan Tokach (Master's student co-mentored by Dr. Autumn Smart and Dr. Judy Wu-Smart) on being awarded a $10,000 national Christi Heintz Memorial Scholarship by Project Apis m!
    Well done, Rogan!
  • Steve Spomer with Beetle CollectionsSpomer nets 40-year Butterfly & Beetle Legacy. Best wishes to Steve Spomer who is retiring this December after 40 years in the Entomology Department. Spomer has identified nearly 700 insect species, including the Salt Creek Tiger Beetle, and taught countless University of Nebraska-Lincoln students. 
  • Bridget Gross with Bees.Bridget Gross, master's student in Entomology, mentored by Dr. Judy Wu-Smart and Dr. Doug Golick, was featured in the Nov. 11th IANR Student Spotlight. Bridget presented her master's degree seminar last month and graduates in December.

  • Check out the Emerald Ash Borer Resource Center, and our Emerald Ash Borer Look-Alike Insects Sheet - Be Sure Before You Treat!