J. Obrycki

John Obrycki

Professional Profile

Research Interests

My specific research interests include the biology, predatory behavior, and population ecology of insect predators, focusing on the Coccinellidae and the role of natural enemies in sustainable alfalfa production systems. A weakness of many pest management models is a trivial representation of predation. Fundamental knowledge is required to understand how insect predators subsist in crops, how they influence prey dynamics, and how changes in cropping practices influence predator populations. The goal of my investigations is to provide the basis for the development of sustainable pest management systems.

Obrycki Mosaic

The asian lady beetle, Harmonia axyridis, adults (left) 
and pink lady beetle, Coleomegilla maculata, larva (right)

Current Graduate Students

Selected Recent Publications

Ecological Assessment of Transgenic Organisms

  • Peterson, J.A., J.J. Obrycki, & J.D. Harwood. 2016. Spiders from multiple functional guilds are exposed to Bt-endotoxins in transgenic corn fields via prey and pollen consumption. Biocontrol Sci. & Tech. (publ. on-line) DOI:10.1080/09583157.2016.1193591.
  • Peterson, J.A., J.J. Obrycki, & J.D. Harwood. 2013. Bacillus thuringiensis : Transgenic Crops: pp. 329-342 In Encyclopedia of Environmental Management Vol I. S.E. Jorgensen (Ed). Taylor & Francis, New York.
  • Peterson, J.A., J.J. Obrycki, & J.D. Harwood. 2009. Quantification of Bt-endotoxin exposure pathways in carabid food webs across multiple transgenic events. Biocontrol Science & Tech. 19: 613-625.
  • Moser, S., J. D. Harwood, & J.J. Obrycki 2008. Larval feeding on Bt hybrid and non-Bt corn seedlings by Harmonia axyridis (Coleoptera : Coccinellidae) and Coleomegilla maculata (Coleoptera : Coccinellidae). Environmental Entomology 37:525-533.
  • Harwood, J.D. & J.J. Obrycki. 2007. Temporal detection of Cry1Ab-endotoxins in coccinellid predators from fields of Bacillus thuringiensis corn. Bull. Entomol.Research 97: 643-648.

Predatory Insects /  Coccinellidae / Biological Control

  • Li, H., Qu, W., Obrycki, J.J., Meng, L., Chu, D., Zhou, X., & Li, B. 2020. Optimizing sample size for genomic study of Harmonia axyridis populations from native and novel ranges. Insects 11(5), 290; https://doi.org/10.3390/insects11050290
  • Mercer, N.H., N.M. Teets, R. T. Bessin, & J. J. Obrycki. 2020. Supplemental foods affect energetic reserves, survival, and spring reproduction in overwintering adult Hippodamia convergens (Coleoptera: Coccinellidae). Environ. Entomol. 49:1-9. https://doi.org/10.1093/nvz137.
  • Vansant, H., Y.M. Vasquez, J.J. Obrycki, A. Sethuraman, 2019. Coccinellid host morphology dictates morphological diversity of the parasitoid wasp Dinocampuscoccinellae. Biological Control (https://doi.org/10.1016/j.biocontrol.2019.02.015).
  • Obrycki, J.J., J.S. McCord, N.H. Mercer, & J.A. White. 2018. Photoperiodic induction of adult diapause in North American populations of the lady beetle Hippodamia convergens (Coleoptera: Coccinellidae). Environ. Entomol. DOI:10.1093/ee/nvy128.
  • Obrycki, J.J. 2018. Reproductive diapause in North American populations of the introduced lady beetle Hippodamia variegata (Coleoptera: Coccinellidae). Environ. Entomol. DOI:10.1093/ee/nvy118.
  • Nechols, J.R., J.J. Obrycki, J.R. Ruberson, L. R. Milbrath, G.S. Albuquerque, Y.-F. Chang, & J. Lopez-Arroyo. 2017. Integrating science with practice: A tribute to the life and work of Maurice J. Tauber. Amer. Entomol. 63(4) 251-258.
  • Sethuraman, A, F. J. Janzen, M.A. Rubio, Y. Vasquez, & J.J. Obrycki. 2017. Demographic histories of 3 predatory lady beetles reveal complex patterns of diversity and population size change in the United States. Insect Science DOI:10.1111/1744-7917.12481.
  • Weiser-Erlandson, L.A., M.E. Rice & J.J. Obrycki. 2016. Early spring occurrence of Empoasca spp. (Hemiptera: Cicadellidae) in and adjacent to alfalfa fields in Iowa. J. Entomol. Science 51: 238-249.
  • Sethuraman, A, F. J. Janzen, & J.J. Obrycki.  2015. Population genetics of the predatory lady beetle, Hippodamia convergens.  Biological Control 84: 1-10.
  • Obrycki, J.J., M.J. Tauber, & C.A. Tauber.  2015. Thermal requirements for development of predatory insects: Contributions of Alois Honěk, including data on three Nearctic species.  Acta Societatis Zoologicae Bohemicae 79: 103-109.
  • Rondoni, G.,K.J. Athey,  J.D. Harwood,  C. Ricci, & J.J. Obrycki.  2015. Development and application of molecular gut-content analysis to detect aphid and coccinellid predation by Harmonia axyridis  (Coleoptera; Coccinellidae) in Italy. Insect Science 22: 719–730. DOI:10.1111/1744-7917.12165.
  • Kajita, Y., J.J. Obrycki, J.J. Sloggett, E.W. Evans, & K.F. Haynes. 2014.  Defensive Chemicals and Interspecific Interactions among Introduced and Native Congeneric Ladybird Beetles. J. Chemical Ecology  40:1212-1219.
  • Jesse, L., M. Collyer, K. Moloney, & J.J. Obrycki. 2013. Distribution of Megastigmus aculeatus (Hymenoptera: Torymidae) and levels of seed predation of Rosa multiflora (Rosaceae) in Iowa. Weed Biology and Management 13: 79-88.
  • Kajita, Y., E.M. O’Neill, Y. Zheng, J.J. Obrycki, & D.M. Weisrock. 2012. A population genetic signature of human releases in an invasive ladybeetle. Molecular Ecology 21: 5473-5483.
  • Bessin, R. & J.J. Obrycki. May 2011. An IPM Scouting Guide for Natural Enemies of Vegetable Pests in Kentucky. ENT-67. 23 pp. May 2011.
  • Seagraves, M.P., Kajita, Y.J., Weber, D.C., John J. Obrycki, J.J. & Lundgren, J.G. 2011. Sugar feeding by coccinellids under field conditions: the effects of sugar sprays in soybean. BioControl 56:305-314.
  • Moser, S.E., Y. Kajita, J.D. Harwood, & J.J. Obrycki. 2011. Evidence for utilization of Diptera in the diet of field-collected coccinellid larvae from an antibody-based detection system. Biological Control 58: 248-254.
  • Eskelson, M.J., E.G. Chapman, D.D. Archbold, J.J. Obrycki, & J.D. Harwood. 2011. Molecular identification of the biological control potential of carabid beetles on exotic and native slugs in a strawberry agroecosystems. Biological Control 56: 245-253.


Ph.D. Cornell University (1982)

John Obrycki