[Ovine dicrocoeliasis: incidence of climatic factors and share in the setting of a forecasting method (author's transl)].

Study of annual activity cycle of ants parasited with Dicrocoelium lanceolatum. Effect of some climatic factors (temperature, rainfall) on seasonal variations of the number of clinching parasited ants. A close analysis of the data displays a double correlation: the increase of the number of clinching ants indirectly brought about by precipitations and this with some delay; a strong decrease by high temperatures in the height of summer. Setting of a calendar including the different stages of the developing cycle of Dicrocoelium lanceolatum in Limousin and proposition of a forecasting technic established from land observations.