Biological control of trichostrongyles in beef cattle by the nematophagous fungus Duddingtonia flagrans in tropical southeastern Brazil

► We analyze the action of fungus Duddingtonia flagrans to control nematodes in beef cattle. ► D. flagrans in pellets of sodium alginate is efficient in the biological control of nematodes. ► The difference in EPG was 56.67% after one year of study when calves were treated with D. flagrans. ► Larvae recovered in the pasture had a percentage reduction of 60.46% when used D. flagrans. ► The formulation of the fungus with pellets applied twice a week reduced the nematode.