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24, chemin de Borde Rouge -Auzeville - CS52627 31326 Castanet Tolosan cedex - France

Last update: May 2021

Menu Logo Principal UB AgroSup CNRS


CORDEAU Stéphane

CORDEAU Stéphane
Equipe/Thème : SYSTEME
Courriel :
Tel :
Fax :

Curriculum Vitae

2010      PhD in Agronomy and Ecology, University of Burgundy (Dijon), FR
2007      MSc in Agronomy, National Institute of Agronomy of Paris-Grignon, FR
2007      Engineer's degree in Agronomy, National Institute of Agronomy of Paris-Grignon, FR


Since Oct. 2012 Research Scientist, French National Research Institute for Agriculture, Food and Environment (INRAE), Research Unit of Agroecology, Dijon, FR
Oct.2015 (1 year) Visiting scientist, Sustainable Cropping Systems Lab, Soil and Crop Science Section, Cornell University, Ithaca, NY, USA
2011-2012 Lecturer, Engineering School of Agronomy (ESA), Department of Plant Ecophysiology and Agroecology (LEVA), Angers, FR
2008-2010 PhD student, French National Institute of Research in Agronomy (INRA), Research Unit ‘Weed Biology and Management’, Dijon, FR
2006-2007 Assistant Engineer Trainee, Technical Center for Oilseed Crops (Terres Inovia), Grignon, FR


Research activities

He leads researches on the impact of cropping systems on weed communities, their biological regulation both in terms of mechanisms and practical implementation in agroecosystem management. The scientific objectives of his research are two-fold: (i) to understand how weed communities respond to agricultural management over time (i.e. changes in population size, diversity and functional traits) and (ii) to evaluate to what extent biological regulation of weeds can help to reduce reliance on herbicides. The practical objective of his research is to design biodiversity-based cropping systems that reduce herbicide use by implementation of no-till and cover crop management and to assess system sustainability in terms of weed regulation and economic viability. He currently leads with Violaine Deytieux the scientific and operational aspects of the INRA CA-SYS platform (described in details below). The platform CA-SYS is one of the major tool he co-develop with farmers, crop advisors, researchers, etc. and now managed to test the hypothesis that wild and cropped diversity could be a means to production sustainable pesticide-free productions. He is a member of the CTPS (French Plant Variety Registration Office) section evaluating cover crop varieties before their registration on the French and European official list. He is also member of the scientific committee Terres Inovia, the technical center for oil and protein crops.



To diverse types of audience (students, farmers, crop advisors)
- Systemic agronomy and cropping system experiment
- Agroécological system experiment : from the concept to the implementation
- Weed biology, identification and field assessment
- Weed biological regulation: from processes to the implementation in the field


  • Publications

  • Adeux G, Cordeau S, Antichi S, Carlesi S, Mazzoncini M, Munier-Jolain NM, Barberi P (in press) Cover crops promote crop productivity but do not enhance weed management in tillage-based cropping systems. European Journal of Agronomy.
  • Mahe I, Cordeau S, Bohan DA, Derrouch D, Dessaint F, Millot D, Chauvel B (in press) Soil seedbank: old methods for new challenges in agroecology? Annals of Applied Biology.
  • Yvoz S, Cordeau S, Zuccolo C, Petit S, (in press). Intraspecific variations in the provision of floral and fruit resources by weeds at a landscape scale. Agriculture, Ecosystems and Environment.
  • Petit S, Deytieux V, Cordeau S (in press) Landscape-scale approaches for designing and assessing biodiversity-based agricultural systems enhancing biological pest control. Environmental Monitoring and Assessment
  • Smith RG, Warren ND, Cordeau S (2020). Are cover crop mixtures better at suppressing weeds than cover crop monocultures? Weed Science 68, 186-194
  • Yvov S, Petit S, Biju-Duval L, Cordeau S (2020). A framework to type farming strategies within a production situation to improve the comprehension of weed communities. European Journal of Agronomy 115, 126009.
  • Mouillon P, Caldwell BA, Cordeau S, Pelzer CJ, Wayman S, Ryan MR (2020). Crop density affects weed suppression in organically managed sunflower. Agronomy Journal. 112, 1-8.
  • Colas F, Cordeau S, Granger S, Jeuffroy M-H, Pointurier O, Queyrel W, Rodriguez A, Villerd J, Colbach N (2020) Co-development of a decision support system for integrated weed management: contribution from future users. European Journal of Agronomy 114, 126010
  • Fried G, Cordeau S, Métay A, Kazakou E (2019) Relative importance of environmental factors and farming practices in shaping weed communities structure and composition in French vineyards. Agriculture Ecosystems, and Environment 275:1-13
  • Adeux G, Munier-Jolain NM, Vieren E, Carlesi S, Barberi P, Cordeau S (2019) Mitigating crop yield losses through weed diversity. Nature Sustainability 2, 1018-1026
  • Adeux G, Munier J, N.M., Meunier D, Farcy P, Carlesi S, Barberi P, Cordeau S (2019) Diversified grain-based cropping systems provide long term weed control while limiting herbicide use and yield losses. Agronomy for Sustainable Development 39, 42
  • Romdhane S, Spor A, Busset H, Falchetto L, Martin J, Bru D, Breuil M-C, Philippot L, Cordeau S (2019) Cover crop management practices rather than the composition of cover crop mixtures affect microbial communities in no-till agroecosystems. Frontiers in Microbiology 10
  • Colbach N, Cordeau S (2018) Reduced herbicide use does not increase crop yield loss if it is compensated by alternative preventive and curative measures. European Journal of Agronomy 94:67-78
  • Cordeau S, Wayman S, Reibel C, Strbik F, Chauvel B, Guillemin JP. (2018) Effects of drought on weed emergence and growth vary with seed burial depth and presence of a cover crop. Weed Biolology and Management 18:12-25
  • Petit S, Cordeau S, Chauvel B, Bohan DA, Guillemin JP, Steinberg C (2018) Biodiversity-based options for arable weed management: a review of processes, field-based evidence and future challenges. Agronomy for Sustainable Development 38:48
  • DiTommaso A, Stokes CA, Cordeau S, Milbrath LR, Whitlow TH (2018) Seed-dispersal ability of the invasive perennial vines Vincetoxicum nigrum and Vincetoxicum rossicum. Invasive Plant Science and Management 11:10-19
  • Colbach N, Cordeau S, Garrido A, Granger S, Laughlin D, Ricci B, Thomson F, Messéan A (2018) Landsharing vs landsparing: How to reconcile crop production and biodiversity? A simulation study focusing on weed impacts. Agriculture, Ecosystems and Environment 251:203-217
  • Mohler CL, Caldwell BA, Marschner CA, Cordeau S, Mahoud Q, Ryan MR, DiTommaso A (2018) Weed seed bank and weed biomass dynamics in a long-term organic vegetable cropping systems experiment. Weed Science 66:611-626
  • Mirsky SB, Ackroyd VJ, Cordeau S, Curran WS, Hashemi M, Reberg-Horton CS, Ryan MR, Spargo JT (2017) Hairy vetch biomass across the Eastern United States: effects of latitude, seeding rate and date, and termination timing. Agronomy Journal. 109:1510-1519
  • Quinio M, De Waele M, Dessaint F, Biju-Duval L, Buthiot M, Cadet E, Bybee-Finley AK, Guillemin J-P, Cordeau S (2017) Separating the confounding effects of farming practices on weeds and winter wheat production using path modelling. European Journal of Agronomy 82:134-143
  • Cordeau S, Smith RG, Gallandt ER, Brown B, Salon P, DiTommaso A, Ryan MR. (2017) Disentangling the effects of tillage timing and weather on weed community assembly. Agriculture 7:66
  • Cordeau S, Smith RG, Gallandt ER, Brown B, Salon P, DiTommaso A, Ryan MR. (2017) How do weeds differ in their response to the timing of tillage? A study of 61 species across the Northeastern United States. Annals of Applied Biology 171: 340–352
  • Cordeau S, Smith RG, Gallandt ER, Brown B, Salon P, DiTommaso A, Ryan MR. (2017) Timing of tillage as a driver of weed communities. Weed Science 65:504-514
  • Cordeau S, Ryan MR, Bohan DA, Reboud X, Chauvel B. (2017) Which traits allow weed species to persist in grass margin strips? Weed Science 65:381-394
  • Jernigan AB, Caldwell BA, Cordeau S, DiTommaso A, Drinkwater LE, Mohler CL, Ryan MR (2017) Weed abundance and community composition in a long-term organic vegetable cropping systems trial. Weed Science 65:639-649
  • Wayman S, Kissing Kucek L, Mirsky SB, Ackroyd V, Cordeau S, Ryan MR (2017) Organic and conventional farmers differ in their perspectives on cover crop use and breeding. Renewable Agriculture and Food Systems 32:376-385
  • Adeux G, Giuliano S, Cordeau S, Savoie J-M, Alletto L (2017) Low-input maize-based cropping systems implementing IWM match conventional maize monoculture productivity and weed control. Agriculture 7:74
  • Gaba S, Perronne R, Fried G, Gardarin A, Bretagnolle F, Biju-Duval L, Colbach N, Cordeau S, Fernandez-Aparicio M, Gauvrit C, Gibot-Leclerc S, Guillemin JP, Louviot G, Moreau D, Munier-Jolain N, Strbik F, Reboud X (2017) Response and effect traits of arable weeds in agro-ecosystems: a review of current knowledge. Weed Research 57:123-147
  • Cordeau S. (2017) Field Margin Grass Strips: Opportunity or Threat for the Weed Management in Arable Landscapes? Agricultural Research & Technology: Open Access Journal 12
  • Cordeau S, Triolet M, Wayman S, Steinberg C, Guillemin J-P. (2016) Bioherbicides: Dead in the water? A review of the existing products for integrated weed management. Crop Protection 87:44-49
  • Petit S, Munier-Jolain N, Bretagnolle V, Bockstaller C, Gaba S, Cordeau S, Lechenet M, Mézière D, Colbach N (2015) Ecological intensification through pesticide reduction: weed control, weed biodiversity and sustainability in arable farming. Environmental Management 56:1078-1090
  • Badenhausser I, Gross N, Cordeau S, Bruneteau L, Vandier M (2015) Enhancing grasshopper (Orthoptera: Acrididae) communities in sown margin strips: the role of plant diversity and identity. Arthropod-Plant Interactions 9:333-346
  • Cordeau S, Guillemin J-P, Reibel C, Chauvel B. (2015) Weed species differ in their ability to emerge in no-till systems that include cover crops. Annals of Applied Biology 166:444-455
  • Cordeau S, Petit S, Reboud X, Chauvel B. (2012) The impact of sown grass strips on the spatial distribution of weed species in adjacent boundaries and arable fields. Agriculture Ecosystems, and Environment 155:35-40
  • Cordeau S, Petit S, Reboud X, Chauvel B. (2012) Sown grass strips harbour high weed diversity but decrease weed richness in adjacent crops. Weed Research 52:88-97
  • Badenhausser I, Cordeau S (2012) Sown grass strip-A stable habitat for grasshoppers (Orthoptera: Acrididae) in dynamic agricultural landscapes. Agriculture Ecosystems and Environment 159:105-111
  • Cordeau S, Reboud X, Chauvel B. (2011) Farmers' fears and agro-economic evaluation of sown grass strips in France. Agronomy for Sustainable Development 31:463-473
  • Cordeau S, Reboud X, Chauvel B. (2010) Relative importance of farming practices and landscape context on the weed flora of sown grass strips. Agriculture Ecosystems and Environment 139:595-602

Principaux contrats :

AOI “Assessing non-intented effects of cover crop termination on biodiversity” 2020

SCOURGE (System ecology of multispecies regulation of weeds)               2019-2021

Dephy Ecophyto MADE IN AB (design and test of organic systems in the French network ROTAB)             2019-2024

GIS Farmer perception of weeds: French survey 2018

Dephy Ecophyto RES0PEST (design and test of pesticde-free systems in the French network Rés0pest)  2018-2023

Dephy Ecophyto ABC (Agroecologie en Bourgogne et Centre)    2018-2023

Casdar RAID (Biological regulation of weed using cover crop: identifying ideotypes)        2018-2021

AOI Plant-Microbe Interaction in cover crop-based systems        2017

Isite Agroecology in Bourgogne Franche-Comté 2017-2021

H2020 IWMPRAISE (Integrated Weed Management: PRActical Implementation and Solutions for Europe)            2017-2022

Casdar VANCOUVER (Weed management by cover crops)            2016-2020

VERTIGO (Test and promotion of cover crop in Vineyard)             2017-2020

BOIS UE (enhancing ecosystem services providing by hedges/woods)     2015-2016

ANR project COSAC (Designing sustainable weed management strategies in a changing context)              2015-2019

ANR Agrobiose (Biodiversity and ecosystem services in intensive cereal systems: an agro-ecology agenda for meeting ECOPHYTO 2018 target)               2014-2018

Burgundy Region program faber, COUVHERBI (effect of cover crop in managing weed species and helping to reduce herbicide use)   2014-2016

CASDAR - project INNOVAB (Design and optimization of innovative organic cropping systems)   2014-2016

PSPE Ecophyto - project CASIMIR (characterization of pests and diseases on various crops)          2013-2016

PhD grant - University of Burgundy         2008-2010




Key Words

Agroecology, Systemic agronomy, Weeds, Cover crop, Conservation agriculture, Weed regulation, CA-SYS