John Tooker, Ph.D.

Media coverage - Read some of the news coverage our work has received!

Current graduate students

• Francesca Ferguson, PhD student in Ecology
  • B.S., Environmental Chemistry, Juniata College
• Daniel Bliss, MS student
  • B.S., Biology, Ursinus College 

Current postdoctoral researchers

Dr. Eric Yip (PhD, Cornell) - Ecology of plant-insect interactions in Solidago

Dr. Matthew Boucher (PhD, Cornell) - Ecology of invertebrate pests in no-till, cover cropped fields, Precision Sustainable Agriculture

Current undergraduate students

• John Sauter

Ken, Jen, Kyra, Dan (L to R) enjoying some gall collecting!

Lab manager

Andrew Aschwanden

Former graduate students

Eric Bohenblust, PhD student, Graduated 2014
(Current position: US EPA)

• EPA STAR Graduate Fellowship
• John Henry Comstock Award from Entomological Society of America
• Asa Fitch Award from Entomological Society of America

Ian Grettenberger, PhD student, Graduated 2015
(Current position: Assistant Professor, Univ. California, Davis)

• USDA NIFA Graduate Fellowship recipient
• USDA NE-SARE Graduate Fellowship recipient
• Sigma Xi Grant-in-Aid of Research recipient

Anjel Helms, PhD student, Graduated 2015 (Ecology Program; co-advised with Mark Mescher)
(Current position: Assistant Professor of Entomology, Texas A&M)

• NSF Graduate Fellowship recipient
• PSU Alumni Association Dissertation Award

Maggie Douglas, MS student, Graduated 2012; PhD student, Graduated 2016
(Current position: Assistant Professor, Dickinson College)

• USDA Borlaug Fellowship recipient
• USDA NE-SARE Graduate Fellowship recipient
• Asa Fitch Memorial Award for Best Masters Student, Eastern Branch of the Entomological Society of America, 2012
• Sigma Xi Grant-in-Aid of Research recipient

Anna Busch, MS student, Graduated 2016
(Current position: Agronomy Extension Educator, Union County, PA)

• B.S., Plant Biology - Michigan State University

Anthony Vaudo, PhD student (co-advised with Christina Grozinger), Graduated 2016
(Current position: Postdoc, Leonard Lab, Dept. of Biology, University of Nevada, Reno)

• M.S., Entomology, University of Florida
• USDA NIFA Graduate Fellowship recipient
• Recipient of North American Pollinator Protection Campaign Bee Health Improvement Project Grant
• Sigma Xi Grant-in-Aid of Research recipient

Angela Coco, MS student, Graduated 2019
(Current position: Product Development Engineer, Hercon Environmental)

• B.S., Environmental Science - King's College

Sarah McTish, MS student, Graduated 2019
(Current position: Extension Educator, Penn State Extension, Berks County, PA)

• B.S., Agricultural Science - Penn State

Kirsten Pearsons, PhD student, Graduated 2020
(Current position: NRCS, Colorado)

• B.S., Environmental Toxicology - University of California, Davis
• USDA NE-SARE Graduate Fellowship recipient

Elizabeth Rowen, PhD student, Graduated 2020
(Current position: Service Assistant Professor of Entomology, West Virginia University)

• M.S., Entomology - Purdue University
• USDA NIFA Graduate Fellowship recipient
• USDA NE-SARE Graduate Fellowship recipient

Melanie Kammerer Allen, PhD student, Graduated 2020 (Ecology Program; co-advised with Christina Grozinger)
(Current position: SCINet Postdoctoral Fellow, USDA-ARS, University Park, PA)

• M.S., Ecology - Penn State
• USDA NIFA Graduate Fellowship recipient

Julie Golinski, MS student, Graduated 2020
(Current position: Associate Entomologist, FMC Corp.)

• B.S., Washington College

Julie Baniszewski, PhD student, Graduated 2021

• M.S., Plant And Soil Science - University of Kentucky
• USDA NE-SARE Graduate Fellowship recipient

Former postdoctoral researchers

• Dr. Kevin Rice (PhD, Ohio State) - Ecology of brown marmorated stink bug (Current position: Assistant Professor, University of Missouri, Division of Plant Sciences)
• Dr. Anjel Helms (PhD, Penn State) - Ecology of plant-insect interactions in Solidago (Current position: Assistant Professor of Entomology, Texas A&M)
• Dr. Marion Le Gall (PhD, Texas A&M) - Ecological control of slugs in no-till crop fields (Current position: Assistant Research Professor, Arizona State University)
• Dr. Kirsten Pearsons (PhD, Penn State) - Ecotoxicology of invertebrates in no-till crop fields

Former undergraduate researchers

Lasair Ni Chochlain, B.S. Penn State Schreyer Honors College, Graduated 2021

Hayden Bock, B.S. Penn State, Graduated 2020

Sarah McTish, B.S. Penn State, Graduated 2017

Allie Shoffner, B.S. Penn State Schreyer Honors College, Graduated 2012

Departmental focus areas

Chemical Ecology

Ecological Applications

Research

Insect-plant interactions in agricultural systems, chemical ecology, induced host-plant defenses, natural-enemy ecology, tritrophic interactions, gall-inducing insects

Word clouds built from batches of recent abstracts

(These clouds give a sense of our research areas/themes/systems. The size of the word is proportional to the frequency of its use in the abstracts; from wordle.com):

2017

2014

2011

Publications

Pearsons, K. A., S. Lower, and J. F. Tooker. Toxicity of clothianidin to common Eastern North American fireflies. PeerJ, in press.

Busch, A. K. B. Ezray, and J. F. Tooker. Life History, Biology, and Distribution of Pterostichus melanarius (Coleoptera: Carabidae) in North America. Environmental Entomology, in press.

Johnston-Fennell, L., J. F. Tooker, B. Nault, and K. Wickings. 2021. Preventative pest management in field crops influences the biological control potential of epigeal arthropods and soil-borne entomopathogenic fungi. Field Crops Research 272:108265.

Baniszewski, J, A. Burton, A. R. Kemanian, G. W. Roth, and J. F. Tooker. 2021. Wheat intraspecific diversity suppressed diseases with subdued economic and ecosystem services benefits. Agriculture, Ecosystems and Environment, 315: 107438.

Pearsons, K. A., E. K. Rowen, K. Elkin, K. Wickings, R. Smith, and J. F. Tooker. Neonicotinoids from seed coatings persistently contaminate adjacent no-till fields, despite mitigation efforts. Environmental Science & Technology 55: 4679-4687.

Tooker, J. F. and K. A. Pearsons. 2021. Newer characters, same story: neonicotinoid insecticides disrupt food webs through direct and indirect effects. Current Opinion in Insect Science 46: 50-56.

Yip, E. C., I. Mikó, J. M. Ulmer; N. A. Cherim; M. A. Townley; S. Poltak, A. M. Helms, C. M. De Moraes; M. C. Mescher, and J. F. Tooker. 2021. Giant polyploid epidermal cells and male pheromone production in the tephritid fruit fly Eurosta solidaginis (Diptera: Tephritidae). Journal of Insect Physiology 130: 104210.

Burton, A. B., J. Baniszewski, G. W. Roth, J. F. Tooker, and A. R. Kemanian. 2021. Are polycultures for silage pragmatic medleys or gallimaufries? Agronomy Journal 113: 1205-1221.

Hammer, T. J., R. De Clerck-Floate, J. F. Tooker, P. W. Price, D.G. Miller III, and E. F. Connor. 2021. Are bacterial symbionts associated with gall induction in insects? Arthropod-Plant Interactions 15: 1-12.

Frame, S. T., K. A. Pearsons, K. R. Elkin, L. S. Saporito, H. E. Preisendanz, H. D. Karsten, and J. F. Tooker. 2021. Assessing surface and subsurface transport of neonicotinoid insecticides from crop fields. Journal of Environmental Quality 50: 476-484.

Kammerer, M., S. Goslee, M. R. Douglas, J. F. Tooker, and C. M. Grozinger. 2021. Shifting norms: wild bees as winners and losers of land use and climate change. Global Change Biology 27: 1250-1265.

Krupke, C. and Tooker, J.F., 2020. Beyond the headlines: the influence of insurance pest management on an unseen, silent entomological majority. Frontiers in Sustainable Food Systems 4: 251. https://doi.org/10.3389/fsufs.2020.595855

Tooker, J. F., and D. Giron. 2020. The evolution of endophagy in herbivorous insects. Frontiers of Plant Science 11: 581816.

Rowen, E. K., and J. F. Tooker. 2020. Ground predator activity-density and predation rates are weakly supported by dry-stack cow manure and wheat cover crops in no-till maize. Environmental Entomology 50: 46-57.

Frank, S. D. and J. F. Tooker. 2020. Opinion: Neonicotinoids pose undocumented threats to food webs. Proceedings of National Academy of Science USA, 117: 22609-22613.

Coco, A. M., M. T. Lewis, S. J. Fleischer, and J. F. Tooker. 2020. Parasitoids, nematodes, and protists in populations of striped cucumber beetle, Acalymma vittatum (Coleoptera: Chrysomelidae). Environmental Entomology 49: 1316–1326.

Pearsons, K. A., and J. F. Tooker. 2021. Preventative insecticide use affects arthropod decomposers and decomposition in field crops. Applied Soil Ecology 157: 103757.

Kirkpatrick, D. M., K. B. Rice, A. Ibrahim, S. J. Fleischer, J. F. Tooker, A. Tabb, H. Medeiros, W. R. Morrison III, and T. C. Leskey. 2020. The influence of marking methods on mobility, survivorship and field recovery of Halyomorpha halys adults and nymphs (Hemiptera: Pentatomidae). Environmental Entomology 49: 1026–1031.

Kammerer, M., J. F. Tooker, and C. M. Grozinger. 2020. A long-term dataset on wild bee abundance in Mid-Atlantic United States. Scientific Data 7: 240.

Yip, E., C. M. De Moraes, J. F. Tooker, M. C. Mescher. 2020. Sensory coevolution: The sex attractant of a gall-making fly primes plant defences, but female flies recognize resulting changes in host-plant quality. Journal of Ecology 109: 99-108.

Vaudo, A. D., J. F. Tooker, H. Patch, D. Biddinger, M. Coccia, M. Crone, M. Fiely, J. Francis, H. Hines, M. Hodges, S. Jackson, D. Michez, J. Mu, L. Russo, M. Safari, E. Treanore, M. Vanderplanck, E. Yip, A. Leonard, and C. Grozinger. 2020. Pollen macronutrient ratios guide broad patterns of bee species floral. Insects 11(2): E132.

Andreas, P., A. Kisiala, R.J.N. Emery, R. De Clerck-Floate, J. F. Tooker, P. W. Price, D. G. Miller III, M.-S. Chen, and E. F. Connor. 2020. Cytokinins are abundant and widespread among insect species. Plants 9: 2.

Rowen, E. K., K. Regan, M. E. Barbercheck, and J. F. Tooker. 2020. Is Tillage Beneficial or Detrimental for Invertebrate Pest Management? A Meta-Analysis. Agriculture, Ecosystems & Environment, in press.

Busch, A. K., M. R. Douglas, G. M. Malcolm, H. D. Karsten, and J. F. Tooker. 2020. A high-diversity/IPM cropping system fosters beneficial arthropod populations, limits invertebrate pests, and produces competitive corn yields. Agriculture, Ecosystems & Environment, in press.

Grettenberger, I. M. and J. F. Tooker. 2020. Variety mixtures of soybeans have inconsistent effects on herbivore and natural-enemy populations. Agriculture, Ecosystems and Environment, in press.

Tooker, J. F., M. E. O'Neal, C. Rodriguez-Saona. 2020. Balancing disturbance and conservation in agroecosystems to improve biological control. Annual Review of Entomology 65: 81-100.

Jones, A. G., K. Hoover, K. Pearsons, J. F. Tooker, and G. W. Felton. 2019. Potential impacts of translocation of neonicotinoid insecticides to cotton (Gossypium hirsutum [Malvales: Malvaceae]) extrafloral nectar on parasitoids" Environmental Entomology, in press. Available online: doi.org/10.1093/ee/nvz157

Walter, J. A., L. W. Sheppard, P. D. Venugopal, D. C. Reuman, G. Dively, J. F. Tooker, and D. M. Johnson. 2019. Weather and crop composition drive spatial synchrony of lepidopteran agricultural pests. Ecological Entomology, in press. Available online: doi.org/10.1111/een.12830

Rowen, E. K., and J. F. Tooker. 2019. Manure decreases herbivore performance but increases early-season damage on corn in the greenhouse and field. Environmental Entomology, in press. Available online: doi.org/10.1093/ee/nvz145

Reed, H., W. Curran, J. Tooker, S. Duiker, and H. Karsten. 2019. Planting green effects on corn and soybean production. Agronomy Journal 111: 2314-2325.

Acevedo, F. E., P. Smith, M. Peiffer, A. M. Helms, J. F. Tooker, and G. W. Felton. 2019. Phytohormones in fall armyworm saliva modulate defense responses in plants. Journal of Chemical Ecology 45: 598–609.

Yip, E., J. F. Tooker, M. C. Mescher, and C. M. De Moraes. 2019. Costs of plant defense priming: Exposure to volatile cues from a specialist herbivore alters growth in tall goldenrod, implications for plant fitness. BMC Plant Biology 19: 209.

Rowen, E. K., J. F. Tooker, and C. Blubaugh. 2019. Soil fertility management to promote arthropod pest suppression. Invited manuscript, Biological Control 134: 130-140.

Yip, E., R. P. Sowers, A. M. Helms, M. C. Mescher, C. M. De Moraes, and J. F. Tooker. 2019. Tradeoffs between defenses against different specialist herbivores in goldenrod (Solidago altissima). Invited manuscript. Arthropod-Plant Interactions 13: 279-287.

Helms, A. M., S. Ray, N. Matulis, Nina, M. Kuzemchak, W. Grisales, J. F. Tooker, and J. Ali. 2019. Chemical cues from belowground natural enemies enhance plant defences and influence herbivore behaviour and performance. Functional Ecology 33: 798-808.

Douglas, M. R., J. Chang, K. Begum, S. Subramanian, J. F. Tooker, S. Nurul Alam, S. Ramasamy. 2019. Evaluation of biorational insecticides and DNA barcoding as tools to improve insect pest management in lablab bean (Lablab purpureus) in Bangladesh. Journal of Asia-Pacific Entomology 21: 1326-1336. https://doi.org/10.1016/j.aspen.2018.10.007

Zemenick, A. T., R. R. Kula, L. Russo, and J. F .Tooker. 2019. A network approach reveals parasitoid wasps to be generalized nectar foragers. Arthropod-Plant Interactions 13: 239-251; available online: doi.org/10.1007/s11829-018-9642-9

Harth, J. E., M. E. Ferrari, A. M. Helms, J. F. Tooker, A. G. Stephenson. 2018. Viral infection limits establishment and severity of a powdery mildew in wild populations of Cucurbita pepo. Frontiers in Plant Science 9: 792.

Walter, J., A. Ives, J. F. Tooker, D, M. Johnson. 2018. Life history and habitat explain variation among insect pest populations subject to global change. Ecosphere 9: e02274.

Vaudo, A. D., L. M. Farrell, H. M. Patch, C. M. Grozinger, and J. F. Tooker. 2018. Consistent pollen nutritional intake drives bumble bee (Bombus impatiens) colony growth and reproduction across different habitats. Ecology and Evolution 8: 5765-5776.

Abbot, P., J. F. Tooker, and S. Lawson. 2018. Chemical ecology and sociality in aphids: opportunities and directions. Journal of Chemical Ecology 44: 770-784.

Tooker, J. F., M. R. Douglas, C. Krupke. 2017. Neonicotinoid seed treatments: limitations and compatibility with Integrated Pest Management. Agricultural & Environmental Letters 2(1), DOI: 10.2134/ael2017.08.0026.

Russo, L, A. Miller, J. F. Tooker, O. Bjornstad, and K. Shea. Quantitative evolutionary patterns in mutualistic networks: Vicariance, phylogenetic tracking, or coevolution? Methods in Ecology and Evolution, in press. DOI: 10.1111/2041-210X.12914

Castano-Duque, L., K. Loades, J. F. Tooker, K. Brown, W. P. Williams, and D. S. Luthe. A maize inbred exhibits resistance against western corn rootwoorm, Diabrotica virgifera virgifera. Journal of Chemical Ecology, in press.

Pearsons, K., I. and J. F. Tooker. 2017. In-field habitat management to optimize pest control of novel soil communities in agroecosystems, Insects 8(3):82. DOI: 10.3390/insects8030082.

Helms, A. M., C. M. De Moraes, A. Tröger, H. T. Alborn, W. Francke, J. F. Tooker, M. C. Mescher. 2017. Identification of an insect-produced olfactory cue that primes plant defenses. Nature Communications 8: 337. DOI:10.1038/s41467-017-00335-8

Le Gall, M., and J. F. Tooker. Developing ecologically based pest management programs for terrestrial molluscs. Journal of Pest Science 90: 825–838.

Pearsons, K., I. Mikó, J. F. Tooker. 2017. The cyanide gland of the greenhouse millipede, Oxidus gracilis (Polydesmida: Paradoxosomatidae). Research Ideas and Outcomes 3: e12249. DOI: 10.3897/rio.3.e12249.

Yip, E., C. M. De Moraes, M. C. Mescher, J. F. Tooker. 2017. The volatile emission of a specialist herbivore alters patterns of plant defence, growth and flower production in a field population of goldenrod (Solidago altissima). Functional Ecology 31: 1062–1070. DOI: 10.1111/1365-2435.12826

Koch, R., B. Potter, P. Glogoza, E. Hodgson, C. Krupke, J. Tooker, C. DiFonzo, A. Michel, K. Tilmon, T. Prochaska, J. Knodel, R. Wright, T. Hunt, B. Jensen, A. Varenhorst, B. McCornack, K. Estes, J. Spencer. 2016. Biology and economics of recommendations for insecticide-based management of soybean aphid. Plant Health Progress 17: 265-269.

Douglas, M. R., and J. F. Tooker. 2016. Meta-analysis reveals that neonicotinoid seed treatments and pyrethroids have similar negative effects on abundance of arthropod natural enemies. PeerJ 4:e2776.

Vaudo, A. D., D. Stabler, H. M. Patch, J. F. Tooker, C. M. Grozinger, and G. A. Wright. 2016. Bumble bees regulate their intake of the essential protein and lipid pollen macronutrients. Journal of Experimental Biology 219: 3962-3970.

Grettenberger, I. M., and J. F. Tooker. 2016. Variety mixtures of wheat influence aphid populations and attract an aphid predator. Arthropod-Plant Interactions, in press. Available online: DOI: 10.1007/s11829-016-9477-1.

Rice, K. B., R. Troyer, K. M. Watrous, J. F. Tooker, and S. J. Fleischer. 2016. Landscape factors influencing stink bug damage in agricultural systems following the introduction of the brown marmorated stink bug (Hemiptera: Pentatomidae). Journal of Economic Entomology, in press. Available online: doi: 10.1093/jee/tow252.

Vaudo, A. D., H. M. Patch, D. A. Mortensen, J. F. Tooker, C. M. Grozinger. 2016. Macronutrient ratios in pollen shape bumble bee (Bombus impatiens) foraging strategies and floral preferences. Proceedings of National Academy of Science USA, 113:E4035-42. Available online: doi: 10.1073/pnas.1606101113.

Campbell C., L. Russo, A. Marins, O. DeSouza, K. Schönrogge, D. Mortensen, J. F. Tooker, R. Albert, and K. Shea. 2016. Top-down network analysis characterizes hidden termite–termite interactions. Ecology and Evolution, in press. doi:10.1002/ece3.2313.

Walls, J. T, P. Caciagli, J. F. Tooker, J. M. Russo, E. G. Rajotte, C. Rosa. 2016. Modeling the decision process for barley yellow dwarf management. Computers and Electronics in Agriculture 127: 775–786.

Grettenberger, I. M. and J. F. Tooker. 2016. Inter-varietal interactions among plants in genotypically diverse mixtures tend to decrease herbivore performance.Oecologia 182: 189-202 (available online: doi:10.1007/s00442-016-3651-0).

Bohnenblust, E. W., A. D. Vaudo, J. F. Egan, D. A. Mortensen, and J. F. Tooker. 2016. Effects of the herbicide dicamba on non-target plants and pollinator visitation. Environmental Toxicology and Chemistry 35(1):144–151. DOI: 10.1002/etc.3169

Rice, K. B., S. J. Fleischer, C. M. De Moraes, M. C. Mescher, J. F. Tooker, and M. Gish. 2015. Handheld lasers allow efficient detection of fluorescent marked organisms in the field. PLoS ONE 10(6): e0129175. doi:10.1371/journal.pone.0129175.

Ray, S., I. Gaffor, F. Acevedo, A. M. Helms, W.-P. Chuang, J.F. Tooker, G. W. Felton, D. S. Luthe. 2015. Maize plants recognize herbivore-associated cues from caterpillar frass. Journal of Chemical Ecology 41: 781–792.

Vaudo, A. D., J. F. Tooker, C. M. Grozinger, and H. M. Patch. 2015. Bee nutrition and floral resource restoration. Current Opinion in Insect Science 10: 133–141. DOI:dx.doi.org/10.1016/j.cois.2015.05.008

Grettenberger, I. M., and J. F. Tooker. 2015. Moving beyond resistance management toward an expanded role for seed mixtures in agriculture. Agriculture, Ecosystems and Environment 208: 29–36. DOI:10.1016/j.agee.2015.04.019

Douglas, M. R., and J. F. Tooker. 2015. Large-Scale Deployment of Seed Treatments Has Driven Rapid Increase in Use of Neonicotinoid Insecticides and Preemptive Pest Management in U.S. Field Crops. Environ. Sci. Technol. 49(8): 5088–5097, DOI: 10.1021/es506141g.

Douglas, M. R., J. R. Rohr, and J. F. Tooker. 2015. Neonicotinoid insecticide travels through a soil food chain, disrupting biological control of non-target pests and decreasing soybean yield. Journal of Applied Ecology 52: 250–260. (Editor's Choice article and image from the article featured on the cover, DOI: 10.1111/1365-2664.12372; and read our Research Brief on the topic, and a related post in the blog of the Journal of Applied Ecology.)

Glenna, L., Tooker, J. F., Welsh, R., Ervin, D. Intellectual property, scientific independence, and the efficacy and environmental impacts of genetically engineered crops. Rural Sociology 80 (2): 147–172.
**Selected The 2015 Paper of the Year in Rural Sociology**

Tooker, J. F., and A. M. Helms. 2014. Phytohormone dynamics associated with gall insects, and their potential role in the evolution of the gall-inducing habit. Journal of Chemical Ecology 40:742-753.

Helms, A. M., C. M. De Moraes, M. C. Mescher, and J. F. Tooker. 2014. The volatile emission of Eurosta solidaginis primes herbivore-induced volatile production in Solidago altissima and does not directly deter insect feeding. BMC Plant Biology 14:173

Vaudo, A. D., H. M. Patch, D. A. Mortensen, C. M. Grozinger, and J. F. Tooker. 2014. Bumble bees exhibit daily behavioral patterns in pollen foraging. Arthropod-Plant Interactions 8: 273-283.

Rice, K., C. Bergh, E. Bergmann, D. Biddinger, C. Dieckhoff, G. Dively, H. Fraser, T. Gariepy, G. Hamilton, T. Haye, A. Herbert, K. Hoelmer, C. Hooks, A. Jones, G. Krawczyk, T. Kuhar, H. Martinson, W. Mitchell, A. Nielsen, D. Pfeiffer, M. Raupp, C. Rodriguez-Saona, P. Shearer, P. Shrewsbury, D. Venugopal, J. Whalen, N. Wiman, T. Leskey, J. Tooker. 2014. Biology, ecology, and management of brown marmorated stink bug (Halyomorpha halys). Journal of Integrated Pest Management 5:A1-A13.

McCarville. M. T., M. E. O'Neal, B. D. Potter, K. J. Tilmon, E. M. Cullen, B. P. McCornack, J. F. Tooker, and D. A. Prischmann-Voldseth. 2014. One gene versus two: a regional study on the efficacy of single gene versus pyramided resistance for soybean aphid management. Journal of Economic Entomology 107(4):1680-1687.

Toth, A. L., J. F. Tooker, S. Radhakrishnan, R. Minard, M. T. Henshaw, C. M. Grozinger. Shared genes related to aggression, rather than chemical communication, are associated with reproductive dominance in paper wasps (Polistes metricus). BMC Genomics 15:75 doi:10.1186/1471-2164-15-75

Egan, J. F., E. W. Bohnenblust, S. Goslee, D. A. Mortensen, and J. F. Tooker. 2014. Herbicide drift affects plant and arthropod communities. Agriculture, Ecosystems, and Environment 185: 77–87.

Bohnenblust, E. W., J. A. Breining, J. A. Shaffer, S. J. Fleischer, G. W. Roth, and J. F. Tooker. 2014. Current European corn borer, Ostrinia nubilalis, injury levels in the Northeastern US and the value of Bt field corn. Pest Management Science 70: 1711-1719. DOI: 10.1002/ps.3712.

Schipanski, M. E., M. Barbercheck, M. R. Douglas, D. M. Finney, K. Haider, J. P. Kaye, A. R. Kemanian, D. A. Mortensen, M. R. Ryan, J. F. Tooker, and C. White. 2014. A conceptual framework for evaluating ecosystem services provided by cover crops in agroecosystems. Agricultural Systems 125: 12-22.

Chung, S. H., C. Rosa, E. D. Scully, M. Peiffer, J. F. Tooker, K. Hoover, D. S. Luthe, and G. W. Felton. 2013. Herbivore exploits orally secreted bacteria to suppress plant defenses. Proceedings of the National Academy of Science, USA 110: 15728-15733.

Bohnenblust, E. W., J Breining, G. W. Roth, and J. F. Tooker. 2013. Corn pith weevil, Geraeus penicillus (Coleoptera: Curculionidae), in transgenic, insect-resistant and conventional field corn hybrids. Journal of Applied Entomology 137: 668-672.

Bohnenblust, E. W., J Breining, S. J. Fleischer, G. W. Roth, and J. F. Tooker. 2013. Corn earworm in Northeastern field corn: pest threat and the value of transgenic hybrids. Journal of Economic Entomology 106 (3): 1250-1259.

Bohnenblust, E., Egan, J.F., Mortensen, D.M., Tooker, J. 2013. Direct and Indirect Effects of the Synthetic-Auxin Herbicide Dicamba on Two Lepidopteran Species. Environmental Entomology 42 (3): 586-594.

Helms AM, De Moraes CM, Tooker JF, Mescher MC. 2013. Exposure of Solidago altissima plants to volatile emissions of an insect antagonist (Eurosta solidaginis) deters subsequent herbivory. Proceedings of National Academy of Science USA 110: 199-204. DOI: 10.1073/pnas.1218606110

Shoffner AV, Tooker JF. 2013. The potential of genotypically diverse cultivar mixtures to moderate aphid populations in wheat (Triticum aestivum L.). Arthropod-Plant Interactions 7: 33-43. (Shoffner was an undergraduate Honors student in the lab.)

Tooker JF, Frank SD. 2012. Genotypically diverse cultivar mixtures for insect pest management and increased crop yields. Journal of Applied Ecology 49:974-985. doi: 10.1111/j.1365-2664.2012.02173.x.

Kim J, Tooker JF, Luthe DS, De Moraes CM, Felton GW 2012. Insect eggs can enhance wound response in plants: a study system of tomato Solanum lycopersicum L. and Helicoverpa zea Boddie. PLoS ONE 7(5): e37420. doi:10.1371/journal.pone.0037420

Tian, D., Tooker, J. F., Peiffer, M., Chung, S., and G. W. Felton. 2012. Role of trichomes in defense against herbivores: Comparison of herbivore response to woolly and hairless trichome mutants in tomato (Solanum lycopersicum). Planta 236: 1053-66.

Tian, D, M. Peiffer, E. Shoemaker, J. Tooker, E. Haubruge, E. Francis, D. S. Luthe, and G. W. Felton. 2012. Salivary glucose oxidase from caterpillars mediates the induction of rapid and delayed-induced defenses in the tomato plant PLoS ONE 7(4): e36168. doi:10.1371/journal.pone.0036168.

Frost, C. J., Smyers E. C., Dean J. M., Mescher M. C, Carlson, J. E., De Moraes C. M., and J. F. Tooker. 2012. A petiole-galling insect herbivore decelerates leaf lamina litter decomposition rates. Functional Ecology 26: 628–636. DOI: 10.1111/j.1365-2435.2012.01986.x

Cui, L.L., F. Francis, Y. Liu, S. Heuskin, G. Lognay, J. Dong, J. Chen, C. Bragard, J. F. Tooker, and Y. Liu. 2012. E-β-Farnesene syngergizes the influence of an insecticide to improve control of cabbage aphids in China. Crop Protection 35: 91–96.

Douglas, M. R. and J. F. Tooker. 2012. Slug (Mollusca: Agriolimacidae, Arionidae) ecology and management in no-till field crops, with an emphasis on the Mid-Atlantic region. Journal of Integrated Pest Management 3: C1-C9.

Graham, E E., J. F. Tooker, and L. M. Hanks. 2012. Floral host plants of adult beetles of central Illinois. Annals of the Entomological Society of America 105: 287-297.

Wang, G., L. L. Cui, J. Dong, F. Francis, Y. Liu, and J. F. Tooker. 2011. Combining intercropping with semiochemical releases: optimisation of alternative control of Sitobion avenae in wheat crops in China. Entomologia Experimentalis et Applicata 140: 189-195.

Kluger, E. C., S. H. Berlocher, L. M. Hanks, and J. F. Tooker. 2011. Consequences of habitat fragmentation for the prairie-endemic weevil Haplorhynchites aeneus. Environmental Entomology 40: 1388-1396.

Tooker, J. F. and C. M. De Moraes. 2011. Feeding by Hessian fly (Mayetiola destructor [Say]) larvae increases levels of fatty acids and indole-3-acetic acid, but not hormones involved in plant-defense signaling. Journal of Plant Growth Regulation 30: 158-165.

Tooker, J. F. and C. M. De Moraes. 2011. Feeding by a gall-inducing caterpillar species increases levels of indole-3-acetic and decreases abscisic acid in Solidago altissima stems. Arthropod-Plant Interactions 5: 115-124.

Onstad, D. W., P. D. Mitchell, T. M. Hurley, J. G. Lundgren, R. P. Porter, C. H. Krupke, J. L. Spencer, C. D. DiFonzo, T. S. Baute, R. L. Hellmich, L. Buschman, W. D. Hutchison, J. F. Tooker. 2011. Seeds of change: Corn seed mixtures for resistance management and IPM. Journal of Economic Entomology 104: 343-352.

Tooker, J. F., and Fleischer, S. J. 2010. First report of western bean cutworm (Striacosta albicosta) in Pennsylvania. Online. Crop Management doi:10.1094/CM-2010-0616-01-RS.

Tooker, J. F, Peiffer M., D. S. Luthe, and G. W. Felton. 2010. Trichomes as sensors: detecting activity on the leaf surface. Plant Signaling & Behavior 5:73-75.

Peiffer M., J. F. Tooker, D. S. Luthe, and G. W. Felton. 2010. Plants on early alert: glandular trichomes as sensors for insect herbivores. New Phytologist 184:644-656.

Tooker, J. F. and C. M. De Moraes. 2009. A gall-inducing caterpillar species increases essential fatty acid content of its host plant without concomitant increases in phytohormone levels. Molecular Plant-Microbe Interactions 22(5): 551-559.

Tooker, J. F. and C. M. De Moraes. 2008. Gall insects and indirect plant defenses: a case of active manipulation? Plant Signaling & Behavior 3:79-80.

Tooker, J. F., J. R. Rohr, W. G. Abrahamson, and C. M. De Moraes. 2008. Gall insects can evade and alter indirect plant defenses. New Phytologist 178: 657671.

Tooker, J. F. and C. M. De Moraes. 2007. Feeding by Hessian fly [Mayetiola destructor (Say)] larvae does not induce plant indirect defences. Ecological Entomology 32:153-161.

Tooker, J. F. and C. M. De Moraes. 2007. Jasmonate, salicylate, and benzoate in insect eggs. Journal of Chemical Ecology 33:331-343.

Tooker, J.F., and C.M. De Moraes. 2006. Jasmonate in lepidopteran larvae. Journal of Chemical Ecology 32: 2321-2326.

Tooker, J.F., and L.M. Hanks.2006. Tritrophic interactions influence reproduction of prairie perennials (Asteraceae: Silphium). Environmental Entomology 35: 537-545.

Tooker, J.F., M. Hauser, and L.M. Hanks. 2006. Floral host plants of syrphidae and tachinidae (Diptera) of central Illinois. Annals of the Entomological Society of America 99: 96-112.

Tooker, J.F. and C.M. De Moraes. 2005. Jasmonate in lepidopteran eggs and neonates. Journal of Chemical Ecology 31: 2753-2759.

Ellis, J.A., A.D. Walter, J.F. Tooker, M.D. Ginzel, P.F. Reagel, E.S. Lacey, A.B. Bennett, E.M. Grossman, and L.M. Hanks. 2005. Conservation biological control in urban landscapes: Manipulating parasitoids of bagworm (Lepidoptera: Psychidae) with flowering forbs. Biological Control 34: 99-107.

Tooker, J.F., A. L.Crumrin, and L.M. Hanks. 2005. Plant volatiles are behavioral cues for adult females of the gall wasp Antistrophus rufus. Chemoecology 15: 85-88.

Tooker, J. F., and L. M. Hanks. 2004. Endophytic insect communities of two prairie perennials (Asteraceae: Silphium spp.). Biodiversity and Conservation 13: 2551-2566.

Tooker, J. F., and L. M. Hanks. 2004. Impact of prescribed burning on endophytic insect communities of prairie perennials (Asteraceae: Silphium spp.). Biodiversity and Conservation 13: 1875-1888.

Tooker, J. F., A. R. Deans, and L. M. Hanks. 2004. Description of the Antistrophus rufus (Hymenoptera: Cynipidae) species complex, including two new species. Journal of Hymenoptera Research 13: 125-133.

Tooker, J. F., and L. M. Hanks. 2004. Trophic position of the endophytic beetle Mordellistena aethiops Smith (Coleoptera: Mordellidae). Environmental Entomology 33: 291-296.

Tooker, J. F., and L. M. Hanks. 2004. Stereochemistry of host plant monoterpenes as mate location cues for the gall wasp Antistrophus rufus. Journal of Chemical Ecology 30: 473-477."

Favret, C., J. F. Tooker, and L. M. Hanks. 2004 Iowana frisoni Hottes (Hemiptera: Aphididae) redescribed, with notes on its biology. Proceedings of the Entomological Society of Washington 106: 26-34.

Tooker, J. F., W. A. Koenig, and L. M. Hanks. 2002. Altered host plant volatiles are proxies for sex pheromones in the gall wasp Antistrophus rufus. Proceedings of National Academy of Science USA 99: 15486-15491.

Tooker, J. F., P. F. Reagel, and L. M. Hanks. 2002. Nectar sources of day-flying Lepidoptera of central Illinois. Annals of the Entomological Society of America 95: 84-96.

Tooker, J. F., and L. M. Hanks. 2000. Influence of plant community structure on natural enemies of pine needle scale (Homoptera: Diaspididae) in urban landscapes. Environmental Entomology 29: 1305-1311.

Tooker, J. F., and L. M. Hanks. 2000. Flowering plant hosts of adult hymenopteran parasitoids of central Illinois. Annals of the Entomological Society of America 93: 580-588.