Microscopie plantes © Photo de Fayette Reynolds M.S, Pexels
Consortium (2025 - 2026)

INTERCOMPLEX - Bringing together an INTERdisciplinary collective to exchange knowledge, methods, and tools to better understand and manage crop disease COMPLEXes.

Most of the work carried out to date in the field of crop health has focused on controlling a single pathogen of a given plant species. However, during the crop cycle, a plant is rarely confronted with a single disease. A whole range of diseases of different origins will develop and impact the crop's development. A growing body of literature points to the existence of diseases that are themselves associated with pathogen complexes affecting the same crop in space (co-infection or simultaneous infection) and time (multi-infection or sequential infection).

Background and challenge 

Crop breeding has considerably improved the resistance of species against pathogens in a targeted manner, but the current breeding method does not consider resistance or tolerance to disease complexes caused by the interaction of multiple pathogens on the scale of a crop cycle. This underlines that sustainable crop health management in the context of disease complexes is not possible, as management levers effective against individual pathogens may be ineffective against pathogen complexes. This calls for a paradigm shift in the way we observe, monitor, and manage plant disease complexes. 

Illustration_INTERCOMPLEX © INRAE

Objectives 

Available knowledge on the pathogen complexes is very limited. In this sense, we wish to consider: 

  • whether and how agro-ecological cropping systems, characterized by greater spatiotemporal crop diversity, the absence or reduction of synthetic inputs, and the absence or reduction of tillage, can provide an opportunity for the management of disease complexes
  • how to mobilize available knowledge, methods, and tools for early detection of plant disease complexes.

The project will bring together specialists from different disciplines (agronomists, plant pathologists, ecologists, geneticists, eco-physiologists, economists, modelers, and population biologists) through webinars and brainstorming retreats. Over the 2 years of the project, we aim to:

  1. Develop a conceptual framework shared by the scientific community on the theme of disease complexes
  2. Share knowledge, tools, and methods useful to the study of plant disease complexes, and gather all key information in a shared database
  3. Identify major obstacles to the understanding and management of crop disease complexes to develop future research priorities
  4. Identify an international partnership that can be mobilized on this topic

Involved research units and partnership

Research unitScientific division Field of expertise 
UMR AGIR AGROECOSYSTEMAgronomy, crop protection
UMR AGIRAGROECOSYSTEMAgronomy (phytopathology, integrated pest management and modeling)
UMR IGEPPSPEPhytopathology, parasitic ecology, population genetics, epidemiology
UMR IGEPPSPEPhytopathology, parasitic ecology, population genetics, epidemiology
UMR IGEPPSPECommunity ecology, population genomics
UMR IGEPPBAPGenetics, breeding
UR BIOGERSPEPhytopathology, epidemiology
UR PSH AGROECOSYSTEMEcology, modeling
UR MIATECOSOCIOEconomics (risk, uncertainty)
UMR SELMET ACTEconomics of innovative systems and diversification sectors
UR BIOSP SPEStatistician, modeling
UMR ISASPEPlant-nematode interactions
UMR BFP SPEPhytopathology
UR PV SPEPhytopathology

External partners

InstitutField of expertise
IRDEcology and evolution of microbial interactions
CIRADPhytopathology, Plant Protection
Université de ToulouseMicrobiology, plant-oomycete interactions
Terres InoviaPhytopathology, Crop Protection, Oilseed and Protein Crops
ArvalisPhytopathology, Crop Protection, Cereal Crops
UNILETPhytopathology, Crop Protection, Agronomy, Vegetable Crops
EUREDENAgronomy, arable crop health

Contact of the coordinator(s):