Root rot of carrot
pH for growth, sporulation, and spore germination ranges from 3.4 to 7.1 (optimum 4.2–4.7). This affinity for acidic conditions may explain the concentration [...] dark brown to black, moist, mostly circular spots 0.5 -1.2 cm diameter that extend only to 2 mm in the root, up to 20-25 per carrot root. They occur h [...] viable at 0°C and 3°C for 12 months, at 6°C for 6 months, and at 12°C for 2 months, indicating a capacity to overwinter in cold regions. Inoculum can survive