Michael Crossley

Headshot of Michael Crossley
Department of Entomology and Wildlife Ecology

Michael Crossley

Assistant Professor / Agricultural Entomologist

250 Townsend Hall
531 S. College Ave,
Newark, DE 19716

Lab website


  • Ph.D. in Entomology (minor in Geographic Information Systems), University of Wisconsin-Madison, 2019
  • M. S. in Entomology, University of Wisconsin-Madison, 2014
  • B. S. in Entomology, University of Wisconsin-Madison, 2011

Courses taught

  • ENWC 311 Insects in Agricultural and Urban Environments
  • ENWC 411/611 Insect Pest Management
  • ENWC 435/635 Population Ecology


Dr. Crossley is an agricultural entomologist and molecular ecologist who integrates eco-informatics and population genomics approaches to understand how changing agricultural landscapes and management practices affect insect ecology and evolution. His research specifically explores the role of rapid evolution in driving pest success and seeks to develop and refine innovative pest management strategies that benefit growers, the environment and society.

  • Ecology and evolution of darkling beetle (Alphitobius diaperinus) in poultry
  • Biological control of slugs in corn and soybean
  • Long-term insect abundance and diversity change in agricultural landscapes
  • Harnessing insects as waste upcyclers and feed
  • Biological control of mushroom phorid flies

Professional Affiliations

  • Entomological Society of America
  • North American Coalition for Insect Agriculture


Ben Sammarco, MS in Entomology

Thabu Mugala, PhD in Entomology and Wildlife Ecology

Find a complete list of publications on Google Scholar

Aigner, BL, MS Crossley, MR Abney. 2021. Biology and management of peanut burrower bug (Hemiptera: Cydnidae) in Southeast USA peanut. Journal of Integrated Pest Management (in press).

Crossley MS, OM Smith, TS Davis, SD Eigenbrode, GL Hartman, D Lagos-Kutz, SE Halbert, DJ Voegtlin, MD Moran, WE Snyder. 2021. Complex life histories predispose aphids to recent decline. Global Change Biology (in press). https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15739

Hemberger J, MS Crossley, C Gratton. 2021. 130 years of agricultural intensification has decreased the occurrence of North American bumble bees. Ecology Letters (in press). https://onlinelibrary.wiley.com/doi/10.1111/ele.13786

Fu Z, MS Crossley, B Epstein, C Bates, DW Crowder, AA Elling, PA Hohenlohe, R Jabbour, RA Ramirez, WE Snyder. 2021. Using fine-scale relatedness to infer natural enemy movement. Biological Control 160:104662. https://www.sciencedirect.com/science/article/pii/S1049964421001328

Krey KL, OM Smith, EG Chapman, MS Crossley, DW Crowder, Z Fu, JD Harwood, AS Jensen, CA Lynch, GB Snyder, WE Snyder. 2021. Prey and predator biodiversity mediate aphid predation by generalists. Biological Control 160:104650. https://www.sciencedirect.com/science/article/pii/S1049964421001201

Crossley MS, OM Smith, LL Berry, R Phillips-Cosio, J Glassberg, KM Holman, JG Holmquest, AR Meier, SA Varriano, MR McClung, MD Moran, WE Snyder. 2021. Recent climate change is creating hotspots of butterfly increase and decline across North America. Global Change Biology 27:2702-2714. https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.15582

Crossley MS, WE Snyder, MD Moran. 2021. MS Crossley et al. reply. Nature Ecology & Evolution 5:595-599. https://www.nature.com/articles/s41559-021-01429-9

Crossley, MS, SD Schoville, VC Radeloff. 2020. Recent collapse of crop belts and declining diversity of US agriculture since 1840. Global Change Biology 27:151–164. https://doi.org/10.1111/gcb.15396

Crossley, MS, and WE Snyder. 2020. What is the spatial extent of a Bemisia tabaci population? Insects 11: 813. https://www.mdpi.com/2075-4450/11/11/813

Gautam, S, MS Crossley, B Dutta, T Coolong, AM Simmons, A Silva, WE Snyder, and R Srinivasan. 2020. Low Genetic Variability in Bemisia tabaci MEAM1 Populations within Farmscapes of Georgia, USA. Insects 11:834. https://doi.org/10.3390/insects11120834

Crossley MS, AR Meier, EM Baldwin, LL Berry, LC Crenshaw, GL Hartman, D Lagos-Kutz, DH Nichols, K Patel, S Varriano, WE Snyder, MD Moran. 2020. No net insect abundance and diversity declines across US Long Term Ecological Research sites. Nature Ecology & Evolution 4:1368–1376 https://doi.org/10.1038/s41559-020-1269-4

Crossley MS, WE Snyder, NB Hardy. 2021. Insect-plant relationships predict the speed of insecticide adaptation. Evolutionary Applications 14:290-296. https://doi.org/10.1111/eva.13089

Yang F, N Liu, MS Crossley, P Wang, Z Ma, J Guo, R Zhang. 2020. Cropland connectivity affects genetic divergence of Colorado potato beetle along an invasion front. Evolutionary Applications 14:553-565. https://doi.org/10.1111/eva.13140

Dively GP, MS Crossley, SD Schoville, N Steinhauer, DJ Hawthorne. 2020. Regional differences in gene regulation may underlie patterns of sensitivity to novel insecticides in Leptinotarsa decemlineata. Pest Management Science 76:4278-4285. https://doi.org/10.1002/ps.5992

Miller T, MS Crossley, F Zhen, AR Meier, DW Crowder, WE Snyder. 2020. Exposure to predators, but not intraspecific competitors, heightens herbivore susceptibility to entomopathogens. Biological Control 151:104403. https://doi.org/10.1016/j.biocontrol.2020.104403

Williams, J, K Burke, MS Crossley, D Grant, V Radeloff. 2019. Land use and climatic causes of environmental novelty in Wisconsin over the past century. Ecological Applications 29:e01955. https://doi.org/10.1002/eap.1955

Crossley, MS, SI Rondon, SD Schoville. 2019. Effects of contemporary agricultural land cover on Colorado potato beetle genetic differentiation in the Columbia Basin and Central Sands. Ecology and Evolution 6:9385-9394. https://doi.org/10.1002/ece3.5489

Crossley, MS, SI Rondon, SD Schoville. 2019. Patterns of genetic differentiation in Colorado potato beetle correlate with contemporary, not historic, potato land cover. Evolutionary Applications 12:804-814. https://doi.org/10.1111/eva.12757

Crossley, MS, SI Rondon, SD Schoville. 2018. A comparison of resistance to imidacloprid in Colorado potato beetle (Leptinotarsa decemlineata Say) populations collected in the Northwest and Midwest U.S. American Journal of Potato Research 95:495–503. https://doi.org/10.1007/s12230-018-9654-0

Crossley, MS, SD Schoville, DM Haagenson, SH Jansky. 2018. Plant resistance to Colorado potato beetle (Coleoptera: Chrysomelidae) in diploid F2 families derived from crosses between cultivated and wild potato. Journal of Economic Entomology 111:1875-1884. https://doi.org/10.1093/jee/toy120

Pélissié, B, MS Crossley, Z Cohen, SD Schoville. 2018. Rapid evolution in insect pests: the importance of space and time in population genomics studies. Current Opinions in Insect Science 26:8-16. https://doi.org/10.1016/j.cois.2017.12.008

Crossley, MS, B Pélissié, Z Cohen, SD Schoville. 2017. Leptinotarsa decemlineata (Coleoptera: Chrysomelidae) observed feeding on Chamaesaracha sp. in Eastern Colorado. The Great Lakes Entomologist 50:93-97. https://scholar.valpo.edu/tgle/vol50/iss2/10

Crossley, MS, YH Chen, RL Groves, SD Schoville. 2017. Landscape genomics of Colorado potato beetle provides evidence of polygenic adaptation to insecticides. Molecular Ecology 26:6284-6300. https://doi.org/10.1111/mec.14339

Crossley, MS, SA Steffan, DJ Voegtlin, KL Hamilton, DB Hogg. 2017. Variable isotopic compositions of host plant populations preclude assessment of aphid overwintering sites. Insects 8:128. http://dx.doi.org/10.3390/insects8040128

Crossley, MS, DB Hogg. 2015. Potential overwintering locations of soybean aphid (Hemiptera: Aphididae) colonizing soybean in Ohio and Wisconsin. Environmental Entomology 44:210-222. http://dx.doi.org/10.1093/ee/nvv012

Crossley, MS, DB Hogg. 2015. Rag virulence among soybean aphids (Hemiptera: Aphididae) in Wisconsin. Journal of Economic Entomology 108:326-338. http://dx.doi.org/10.1093/jee/tou022

Meehan, TD, MS Crossley, RL Lindroth. 2010. Impacts of elevated CO2 and O3 on aspen leaf litter chemistry and earthworm and springtail productivity. Soil Biology and Biochemistry 42: 1132-1137. http://dx.doi.org/10.1016/j.soilbio.2010.03.019