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.
Crown rot fungi often infect through wounds.
Stresses such as insect feeding, other diseases, poor fertility, etc. increase susceptibility to these fungi. Use adapted varieties. Maintain adequate fertility, especially potash. Allow 5-6 weeks between last harvest and freezedown.