White cottony fungal growth is found on infected tissues before dew dries. Infected crowns and roots turn brown and eventually die. Infections begin in late October from airborne spores. The fungus, common in fields and pastures in many areas of Kentucky, is very long-lived. It also attacks alfalfa and other clovers.
Red clover is susceptible throughout the life of the stand.
Can be difficult to manage where severe. Deep plowing can reduce spore levels in some cases. Rotations of 4-5 years or longer away from forage legumes can also reduce spore levels. Fall grazing or clipping removes infected stems and reduces crown infections. Brown to black decay of roots and crowns.