Written by AAEP
Tall fescue is a grass which grows on over 35 million acres of land in the United States. As many as 700,000 horses may graze fescue pastures or be fed fescue hay each year. Many of these pastures contain fescue that is infected with an endophytic fungus that is toxic to horses. When the horse ingests the grass, it is steadily poisoned by alkaloids produced by the fungus.