Avoid replanting alfalfa directly into old alfalfa stubble. This practice allows diseases to move directly to the new seedlings. If available, apply timely irrigation to avoid excessive moisture stress. However, also avoid flooding for extended periods. Avoid cultivating established stands.
Mechanical injuries provide a pathway for fungal pathogens to invade roots.
If the stand must be cultivated, some plants will be lost immediately, but others will become infected and begin a slow decline. Avoid excessive traffic on the field, especially when the soil is wet. Wheeled or hoofed traffic can split crowns and open them to invasion. This allows recharging of the carbohydrate reserve and also traps snow. If necessary, the frost- killed forage can be removed after winter dormancy begins.