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

Last update: May 2021

Menu INRA logo Inra FN3PT Fédération Nationale des Producteurs de Plant de Pomme de Terre

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Studying the biological characteristics of pathogens including potentially emerging populations

Survey for blackleg
root-knot - Meloidogyne nematod
Experiment in controlled conditions (greenhouse)

Acquiring biological and epidemiological data on parasites (source of inoculum, soil and climate conditions that favor pathogens, host plants, tolerant plants) is important to maintain the health status of seed potatoes and their growing environment. Improving epidemiological knowledge will enable better control through the use of non-reproducing crops (sanitizing plants), appropriate cultivation techniques and appropriate crop rotations. Knowledge of the evolution and diversity of pathogen populations is indispensable for the successful development of strategies based on genetic control.

  • Monitoring of pathogens present in France and throughout Europe

Surveys are underway to collect strains/isolates/populations of different types of pathogens (pectolytic bacteria, fungi, viruses). The populations of pathogens are characterized using phenotypic criteria (sexual types, aggressiveness, virulence) and molecular techniques to evaluate the likelihood (or the risk) of changes in pathogen populations. These data are then compared with data on populations from other countries.

  • Evaluation of cultivation practices

The effects of cultivation practices, (products used), of rotation crops or intercrops on the kinetic development of soil pathogens are analyzed using suitable detection or quantification methods.

  • Surveillance of the emergence of new pathogens

Risks due to commercial exchanges and climate change must be taken into account. Biovigilance (i.e. the detection, gathering and analysis) of information regarding the risk of introduction of new potato pathogens such as Zebra chips (Candidatus Liberibacter solanacearum), as well as new strains or isolates of pathogens that are already present in the territory.

This will be undertaken by:

  • Reviews of the literature;
  • Attending international conferences;
  • Exchanges and collaborations with specialized international research institutes and professional organizations.
Zebra chips

Zebra chips symptoms ©J.Munyaneza (USA)


TSWV (Tomato Spotted Wilt Virus) © C.R. Wilson (Australia)