John Tooker

Professor of Entomology

John Tooker

Huck Graduate Students

Huck Affiliations

Publication Tags

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Insecticide Insecticides Seed Pests Galls Bees Pest Control Nutrition Herbivory Insecta Seeds Ecology Maize Pollen Pest Soybeans Cover Crops Corn Neonicotinoid Pesticide Slugs Arthropod Crop Planting Zinc Gall

Most Recent Publications

Abscisic Acid: A Potential Secreted Effector Synthesized by Phytophagous Insects for Host-Plant Manipulation

Stephannie Seng, Gabriela E. Ponce, Peter Andreas, Anna Kisiala, Rosemarie De Clerck-Floate, Donald G. Miller, Ming Shun Chen, Peter W. Price, John F. Tooker, R. J.Neil Emery, Edward F. Connor, 2023, Insects

New Information about Lizard Beetles (Coleoptera: Erotylidae: Languria angustata (Beauvois, 1805) and Languria mozardi Latreille, 1807) in Pennsylvania

Michael J. Skvarla, John Tooker, Adriana Murillo-Williams, 2023, Coleopterists Bulletin on p. 28-31

Nematodes Associated with Terrestrial Slugs in Mid-Atlantic (Delaware, USA) Soybean

Brian Kunkel, William J. Cissel, John F. Tooker, Dana K. Howe, Dee R. Denver, Rory J. Mc Donnell, Ivan Hiltpold, 2023, Agronomy

Extreme acidity in a cynipid gall: a potential new defensive strategy against natural enemies

Antoine Guiguet, Nathaniel B. McCartney, Kadeem J. Gilbert, John F. Tooker, Andrew R. Deans, Jared Gregory Ali, Heather M. Hines, 2023, Biology Letters

Adverse effects of inbreeding on the transgenerational expression of herbivoreinduced defense traits in Solanum carolinense

Chad T. Nihranz, Anjel M. Helms, John F. Tooker, Mark C. Mescher, Consuelo M. De Moraes, Andrew G. Stephenson, 2022, PLoS One

The effect of zinc fertilizer on maize growth, leaf mineral nutrition, and caterpillar herbivory

Elizabeth K. Rowen, John F. Tooker, 2022, Arthropod-Plant Interactions on p. 525-535

Planted-green cover crops in maize/soybean rotations confer stronger bottom-up than top-down control of slugs

Marion Le Gall, Matthew Boucher, John F. Tooker, 2022, Agro-Ecosystems

Oak Galls Exhibit Ant Dispersal Convergent with Myrmecochorous Seeds

Robert J. Warren, Antoine Guiguet, Chloe Mokadam, John F. Tooker, Andrew R. Deans, 2022, American Naturalist on p. 292-301

Early-season plant cover supports more effective pest control than insecticide applications

Elizabeth K. Rowen, Kirsten A. Pearsons, Richard G. Smith, Kyle Wickings, John F. Tooker, 2022, Ecological Applications

Insecticide-contaminated honeydew: risks for beneficial insects

Miguel Calvo-Agudo, John F. Tooker, Marcel Dicke, Alejandro Tena, 2022, Biological Reviews on p. 664-678

Most-Cited Papers

A framework for evaluating ecosystem services provided by cover crops in agroecosystems

Meagan E. Schipanski, Mary Barbercheck, Margaret R. Douglas, Denise M. Finney, Kristin Haider, Jason P. Kaye, Armen R. Kemanian, David A. Mortensen, Matthew R. Ryan, John Tooker, Charlie White, 2014, Agricultural Systems on p. 12-22

Large-scale deployment of seed treatments has driven rapid increase in use of neonicotinoid insecticides and preemptive pest management in U.S. Field crops

Margaret R. Douglas, John F. Tooker, 2015, Environmental Science & Technology on p. 5088-5097

Herbivore exploits orally secreted bacteria to suppress plant defenses

Seung Ho Chung, Cristina Rosa, Erin D. Scully, Michelle Peiffer, John F. Tooker, Kelli Hoover, Dawn S. Luthe, Gary W. Felton, 2013, Proceedings of the National Academy of Sciences of the United States of America on p. 15728-15733

Biology, ecology, and management of brown marmorated stink bug (Hemiptera: Pentatomidae)

Kevin B. Rice, Chris J. Bergh, Erik J. Bergmann, Dave J. Biddinger, Christine Dieckhoff, Galen Dively, Hannah Fraser, Tara Gariepy, George Hamilton, Tim Haye, Ames Herbert, Kim Hoelmer, Cerruti R. Hooks, Ashley Jones, Greg Krawczyk, Thomas Kuhar, Holly Martinson, William Mitchell, Anne L. Nielsen, Doug G. Pfeiffer, Michael J. Raupp, Cesar Rodriguez-Saona, Peter Shearer, Paula Shrewsbury, P. Dilip Venugopal, Joanne Whalen, Nik G. Wiman, Tracy C. Leskey, John F. Tooker, 2014, Journal of Integrated Pest Management

Bee nutrition and floral resource restoration

Anthony D. Vaudo, John F. Tooker, Christina M. Grozinger, Harland M. Patch, 2015, Current Opinion in Insect Science on p. 133-141

Macronutrient ratios in pollen shape bumble bee (Bombus impatiens) foraging strategies and floral preferences

Anthony D. Vaudo, Harland M. Patch, David A. Mortensen, John F. Tooker, Christina M. Grozinger, 2016, Proceedings of the National Academy of Sciences of the United States of America on p. E4035-E4042

Neonicotinoid insecticide travels through a soil food chain, disrupting biological control of non-target pests and decreasing soya bean yield

Margaret R. Douglas, Jason R. Rohr, John F. Tooker, 2015, Journal of Applied Ecology on p. 250-260

Pollen protein: Lipid macronutrient ratios may guide broad patterns of bee species floral preferences

Anthony D. Vaudo, John F. Tooker, Harland M. Patch, David J. Biddinger, Michael Coccia, Makaylee K. Crone, Mark Fiely, Jacob S. Francis, Heather M. Hines, Mackenzie Hodges, Stephanie W. Jackson, Denis Michez, Junpeng Mu, Laura Russo, Maliheh Safari, Erin D. Treanore, Maryse Vanderplanck, Eric Yip, Anne S. Leonard, Christina M. Grozinger, 2020, Insects

Herbicide drift can affect plant and arthropod communities

J. Franklin Egan, Eric Bohnenblust, Sarah Goslee, David Mortensen, John Tooker, 2014, Agro-Ecosystems on p. 77-87

Phytohormone Dynamics Associated with Gall Insects, and their Potential Role in the Evolution of the Gall-Inducing Habit

John F. Tooker, Anjel M. Helms, 2014, Journal of Chemical Ecology on p. 742-753

News Articles Featuring John Tooker

Oct 16, 2023

Grants awarded to Penn State faculty for tropical ecosystems research in Belize

Three projects have been awarded seed grants as part of the Penn State-Belize Foundation for Research and Environmental Education Research and Education Initiative to develop agroforestry systems .

Full Article

Apr 05, 2023

Why are snails and slugs so slow?

Wander through your backyard or walk along a stream and it’s likely you’ll see a snail – small, squishy animals with shells on their backs.

Full Article

Mar 01, 2023

Wasps harness power of pitcher plants in first-ever observed defense strategy

As the saying goes, “When life gives you lemons, turn that tartness into little translucent balls in which to grow your young.”

Full Article

Sep 05, 2022

A boy’s backyard discovery two years ago uncovered an incredibly intricate insect-plant interaction

A chance discovery by a professor’s son reveals a surprisingly complex interaction between plants and insects.

Full Article

Mar 21, 2022

The Fight to Save the Embattled Monarch Butterfly

In the depths of the Californian winter, an ember of hope has flickered for the monarch butterfly, the charismatic and beloved visitor that has seemingly been on a graceful descent into oblivion.

Full Article

Mar 09, 2022

EPA Expected to Extend Use of Bee-Killing Pesticides

The U.S. Environmental Protection Agency (EPA) is expected to approve a proposal to extend the use of four neonicotinoids for the next 15 years. These pesticides are known to be especially dangerous for essential pollinators, like bees and butterflies, and have been linked to the widespread decline of insect populations.

Full Article

Mar 08, 2022

Fears for bees as US set to extend use of toxic pesticides that paralyse insects

The US Environmental Protection Agency is poised to allow the use of four of the most devastating chemicals to bees, butterflies and other insects to continue in America for the next 15 years, despite moves by the European Union to ban the use of toxins that have been blamed for widespread insect declines.

Full Article

Feb 22, 2022

Farmers are overusing insecticide-coated seeds, with mounting harmful effects on nature

Planting season for corn and soybeans across the U.S. will begin as soon as March in Southern states and then move north. As farmers plant, they will deploy vast quantities of insecticides into the environment, without ever spraying a drop.

Full Article

Apr 05, 2021

US Pesticide Use Is Down, but Damage to Pollinators Is Rising

The use of pesticides has decreased in the US by more than 40 percent since 1992, but the emergence of more-potent chemicals means that they are far more damaging to many species.

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Apr 01, 2021

Birds versus bees: Here are the winners and losers in the great pesticide trade-off

Farms are battlefields, pitting growers against rapacious pests and aggressive weeds in never-ending, costly campaigns that often involve chemical weapons. Those weapons, alas, also harm innocent bystanders such as bees, fish, and crustaceans. Now, a large study charts epic shifts that have occurred in recent decades as U.S. farmers have changed their arsenal of pesticides.

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