Deoxynivalenol (DON) is a mycotoxin occuring in grains such as barley, maize, oats, rye, and wheat. It occurs less often in rice, sorghum, and triticale. The plant pathogens Fusarium graminearum (Gibberella zeae) and F. culmorum, which are causing Gibberella ear rot in maize and Fusarium head blight in wheat, are associated with the occurence of Deoxynivalenol. DON is a type B trichothecene, an epoxy-sesquiterpeneoid.Alternative name: Vomitoxin.