disease_position_erumpent
emerge
The smut sorus replaces the grains in infected ears, but is covered by a membrane which does not rupture and release the teliospores until harvest. Smutted heads emerge later than healthy ones or may be trapped in the 'boot'. Ears may be partially smutted and sori occasionally develop as elongated stripes on the flag leaf. Stem galls may also occur.
Ustilago segetum var. hordei
Ustilago hordei