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Accueil > Français > Équipes > Interactions hôtes-parasites (IHP) > Projets de recherche de l’équipe Interactions Hôtes-Parasites > Pathogénie des Nosema chez les abeilles et nouveaux moyens de lutte

The Nosema parasites of the honeybee

par FredDelbac - publié le , mis à jour le

The honeybee decline

Massive losses of domesticated European honeybee colonies have been observed for a decade worldwide. This increase of losses is of worrying concern at both biological and economical perspectives. As pollinators, honeybees participate in flowering plant diversity. Together with other pollinators, they are key factors for agricultural, especially crop, production. Nowadays, most researchers suggest that this honeybee decline as a multifactorial origin, that would involves :

- the insect ecology, that would reflect environmental changes due to natural (e.g. predation, climate) and anthropogenic (e.g. agricultural practices) phenomena

- numerous pathogens, such as viruses, bactaria, fungi and parasites, including the two microsporidian species Nosema apis et Nosema ceranae , that are the ethiologic agents of the honeybee nosemosis.

Our research programs on Nosema

The Nosema parasites infect the European honeybee Apis mellifera and may induce high mortality of insects and sometimes loss of the entire colony. The increase of N. ceranae prevalence together with the increase of honeybee losses suggested that both phenomena could be linked. However, N. ceranae has been observed in diseased as well as healthy colonies.

Our objectives are to clarify the role of the Nosema parasites in the colony losses and to understand why some hives are maintained healthy despite the presence of the parasites while others are not. Our our focuses on several axes :

- I. The study of Nosema ceranae-pesticides interactions in Apis mellifera

- II. The study of the Nosema pathogenicity and the characterization of some of their virulence factors

- III. The study of the diversity of the Nosema parasites

- IV. The search for new treatments against the nosemosis

Photo M. Roudel, LMGE

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