This includes use of healthy transplants, proper site preparation to provide good water drainage away from roots, use of balanced fertilizer, and rotation in the garden plantings for two or three years with unrelated plants to help prevent the buildup of pathogens in one area. It is also important to remove crop residue at the end of the season to help reduce pathogen survival. Once a pathogen is identified, try to find and use resistant varieties when available. Remember to check the soil for moisture before assuming a wilting plant needs more water. Even if all of the above practices are followed, rot may still occur.
Fungicides are available to control the major groups of fungi.
Fungicides may be helpful when a root rot is discovered in a flowerbed and the goal is to preserve remaining healthy plants. Be sure to read and follow all label directions on fungicides. Also be sure the plant and fungus in question are listed on the label.