Faculty

John Wallace

Associate Professor of Plant Sciences

423 ASI
University Park, PA

Email jmw309@psu.edu
Phone 814-863-1014

Areas of Expertise

Cover Crop Agricultural and Biological Sciences
Cover Crops Keyphrases
Herbicide Agricultural and Biological Sciences
Cereal Rye Keyphrases
Cropping System Agricultural and Biological Sciences
Vicia Villosa Agricultural and Biological Sciences
Pennsylvania Keyphrases
Grains Agricultural and Biological Sciences

High-resolution surface and rootzone soil moisture over US cropland
Shuohao Cai, Yijia Xu, Zhengwei Yang, Wade T. Crow, Zhou Zhang, Jiali Shang, Jiangui Liu, Peter La Follette, Chris Reberg-Horton, Harry Schomberg, Steven Mirsky, Brian Davis, Sarah Seehaver, Alexis Correira, Andrea Basche, Ashley Waggoner, Charles Ellis, Dara Park, Danielle D. Treadwell, David Campb..., Mar 1 2026, In: Remote Sensing of Environment
Date: Mar 1 2026

Sowing date and seeding rate influence cereal rye productivity across the Northeastern United States
Laurel Wellman, Gwendolyn A. Bagley, Jamie Crawford, Heather Darby, Nora Doonan, Masoud Hashemi, Sarah Marie Hirsh, Ivy Krezinski, Steven Mirsky, Virginia Moore, Barbara Scott, Artie Siller, Haiying Tao, Mark VanGessel, Kurt Vollmer, Dave Votypka, John M. Wallace, Mar 1 2026, In: Agronomy Journal
Date: Mar 1 2026

Wash-off potential from living and aged cover crop residues differs among soil-residual herbicide sorption properties
Cody Smith, Caio Brunharo, Kyle Elkin, Michael Flessner, Mark Vangessel, John M. Wallace, 2026, In: Weed Science
Date: 2026

Manipulating cover crop termination time to alter soil moisture dynamics and mitigate soybean water stress
Navdeep Kaur, Aline de Camargo Santos, Megan Czekaj, John Wallace, Daniela R. Carrijo, Nov 1 2025, In: Agronomy Journal
Date: Nov 1 2025

Effect of tillage system on epigeal and foliar insect predation in an organic cropping system in Pennsylvania, USA
Shea A.W. Tillotson, Christina A. Voortman, John M. Wallace, Mary E. Barbercheck, Jul 2025, In: PloS one
Date: Jul 2025

Feeding by slugs on maize imposes variable productivity costs but can induce compensatory growth under some conditions
John F. Tooker, Matthew T. Boucher, John M. Wallace, Margaret R. Douglas, 2025, In: Pest Management Science
Date: 2025

Soil-mediated effects of cover crops on weed-crop competition
Alicia Rouge, John M. Wallace, Stéphane Cordeau, Delphine Moreau, Jean Philippe Guillemin, Carolyn J. Lowry, Jan 1 2025, In: Weed Research
Date: Jan 1 2025

Herbicide deposition and wash-off potential is affected by cover crop management tactics used in planting green systems
Cody Smith, Caio Brunharo, Kyle Elkin, Michael Flessner, Mark VanGessel, John M. Wallace, 2025, In: Weed Science
Date: 2025

Tillage type and sentinel insect species affect the relative prevalence of the entomopathogenic fungus, Metarhizium robertsii, in soil
Shea A.W. Tillotson, Christina A. Voortman, John M. Wallace, Mary E. Barbercheck, Jan 2025, In: PloS one
Date: Jan 2025

U.S. cereal rye winter cover crop growth database
Alexandra M. Huddell, Resham Thapa, Guillermo S. Marcillo, Lori J. Abendroth, Victoria J. Ackroyd, Shalamar D. Armstrong, Gautam Asmita, Muthukumar V. Bagavathiannan, Kipling S. Balkcom, Andrea Basche, Shawn Beam, Kevin Bradley, Lucas Pecci Canisares, Heather Darby, Adam S. Davis, Pratap Devkota, Wa..., Dec 2024, In: Scientific Data
Date: Dec 2024

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Cover crop termination timing is critical in organic rotational no-till systems
C. L. Keene, W. S. Curran, J. M. Wallace, M. R. Ryan, S. B. Mirsky, M. J. Vangessel, M. E. Barbercheck, Jan 1 2017, In: Agronomy Journal
Citations: 82

Cover crop-based, organic rotational no-till corn and soybean production systems in the mid-atlantic United States
John M. Wallace, Alwyn Williams, Jeffrey A. Liebert, Victoria J. Ackroyd, Rachel A. Vann, William S. Curran, Clair L. Keene, Mark J. Vangessel, Matthew R. Ryan, Steven B. Mirsky, Apr 2017, In: Agriculture (Switzerland)
Citations: 81

Evaluation of cover crops drill interseeded into corn across the mid-Atlantic region
W. S. Curran, R. J. Hoover, S. B. Mirsky, G. W. Roth, M. R. Ryan, V. J. Ackroyd, J. M. Wallace, M. A. Dempsey, C. J. Pelzer, Mar 1 2018, In: Agronomy Journal
Citations: 66

Alternative performance targets for integrating cover crops as a proactive herbicide-resistance management tool
Jess M. Bunchek, John M. Wallace, William S. Curran, David A. Mortensen, Mark J. Vangessel, Barbara A. Scott, 2020, In: Weed Science
Citations: 51

Cover crop effects on horseweed (Erigeron canadensis) density and size inequality at the time of herbicide exposure
John M. Wallace, William S. Curran, David A. Mortensen, May 1 2019, In: Weed Science
Citations: 51

Ecological characteristics of Ventenata dubia in the Intermountain Pacific Northwest
John M. Wallace, Pamela L.S. Pavek, Timothy S. Prather, Jan 1 2015, In: Invasive Plant Science and Management
Citations: 46

Organic fertility inputs synergistically increase denitrification-derived nitrous oxide emissions in agroecosystems
Debasish Saha, Jason P. Kaye, Arnab Bhowmik, Mary Ann Bruns, John M. Wallace, Armen R. Kemanian, Oct 2021, In: Ecological Applications
Citations: 41

Cover crop-based reduced tillage system influences Carabidae (Coleoptera) activity, diversity and trophic group during transition to organic production
Ariel Rivers, Christina Mullen, John Wallace, Mary Ellen Barbercheck, Jan 10 2017, In: Renewable Agriculture and Food Systems
Citations: 40

Integrated Weed Management Strategies in Cover Crop-based, Organic Rotational No-Till Corn and Soybean in the Mid-Atlantic Region
John M. Wallace, Clair L. Keene, William Curran, Steven Mirsky, Matthew R. Ryan, Mark J. Vangessel, Jan 1 2018, In: Weed Science
Citations: 35

Weed-Insect Interactions in Annual Cropping Systems
Mary E. Barbercheck, John Wallace, Mar 1 2021, In: Annals of the Entomological Society of America
Citations: 34

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Centers & Institutes

Plant Institute

Elsevier Pure Profile

John Wallace

Areas of Expertise

Legal Statements