Cultural practices can also promote reduction of "Alternaria dauci". They include practices that will lower the duration of leaf wetness and soil moisture. Planting on raised beds with wider row spacing has been shown to reduce soil moisture, thereby limiting the spread of the disease. Symptoms tend to be more severe on carrots that are stressed or poorly fertilized. In order to avoid more severe symptoms, keep the plants free of injury, watered, and adequately fertilized. Although resistant varieties are not available, the susceptibility of the carrot differs by variety. The varieties least susceptible vary by state, and a list of varieties appropriate to a specific area can be found through the state's extension program. In the Midwest, the University of Wisconsin and the University of Michigan have bred varieties including Atlantis, Beta III, and Chancellor that exhibit resistance.